Our look back at this week in Denver weather history is dominated by some relatively common late spring / early summer weather events, especially lightning, hail and wildfires.

From the National Weather Service:

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In 2000…two large wildfires developed in the Front Range foothills as careless campers and very dry conditions proved to be a dangerous combination. Strong winds gusting in excess of 60 mph on the 13th fanned the flames… Spreading both wildfires out of control. Winds gusted to 78 mph atop Niwot Ridge near the Continental Divide west of Boulder. The Hi Meadows wildfire…about 35 miles southwest of Denver…consumed nearly 11 thousand acres and 80 structures…mostly high priced homes. The Bobcat wildfire…located about 12 miles southwest of Fort Collins… Consumed nearly 11 thousand acres and 22 structures. Late on the 16th…a strong cold front moved south over the great plains into northeastern Colorado. Low level upslope conditions developed in the wake of the front…producing 2 to 4 inches of snowfall overnight at elevations above 8 thousand feet. Firefighters were able to contain both fires shortly thereafter.

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In 1907…south winds were sustained to 40 mph. The winds were strong all day.

In 1908…the hail storm was unusually severe. Heavy clouds moved over the city from the north and northwest…and by late morning the weather had become very threatening. Heavy rain with intermittent hail from pea to 3/4 inch in diameter fell near noon. The fall of rain and hail totaled 0.68 inch of precipitation with 0.35 inch in just 5 minutes. The temperature fell from 71 degrees to 51 degrees during the storm. The hail did considerable damage to trees…gardens…and hot houses. On sidewalks with northern exposures…the hail ranged in depth from 2 to 6 inches. West winds were sustained to 29 mph during the storm.

In 1956…strong southeast winds raked metro Denver all day. Sustained winds at 44 mph with gusts as high as 61 mph were recorded at Stapleton Airport where blowing dust briefly reduced the visibility to 2 miles.

In 1984…golf ball size hail pelted southern and central Aurora. Rainfall of 2.06 inches over central Aurora in just over an hour produced local street flooding.

In 1987…golf ball size hail fell in the southern part of Lakewood.

In 1988…several tornadoes developed across metro Denver. One tornado touched down just northeast of the rocky mountain arsenal. The twister moved very slowly and did no damage…except to demolish a small electrical substation… Even though it was on the ground for nearly 30 minutes. Later…another tornado was sighted east of Brighton about 2 miles north of Barr Lake. An f2 tornado cut a swath through northeast Denver. The main path went through a thickly wooded area for about 6 blocks and uprooted about 500 city owned trees…many of them large elms 75 to 100 years old. Hundreds of privately owned trees were also sucked from the ground by the slow moving twister…which was filmed by a news team in a helicopter as it uprooted trees. The replacement cost to the city owned trees was estimated at 1.5 million dollars. The twister did little damage to buildings. Some homes suffered roof and chimney damage…a gas main was ruptured…and some cars were damaged by falling trees. The uprooted trees also caused curb and sidewalk damage and cut some electrical wires. The funnel cloud passed close to Stapleton International Airport. Aircraft operations were shut down…and the tower was evacuated. The tornado was on the ground for almost 25 minutes. An f3 tornado cut an erratic path through south Denver for about 25 minutes…causing extensive damage in at least 3 areas. The twister damaged about 85 buildings… 20 severely; the total loss was estimated at 5 to 10 million dollars. Many cars were severely damaged; at least 15 vehicles were overturned. One trailer was lifted onto the top of a building that had just been unroofed; numerous antique cars inside the building were damaged. A Ford Bronco was blown over a church…and landed 100 yards away. A metal storage shed was deposited far above the ground in some power lines. The tornado uprooted many trees on a golf course. No one was seriously hurt…although seven people suffered minor injuries from flying debris. A golfer was thrown 40 feet…but was not hurt; a man clinging to a telephone pole was unscathed…but lost both shoes…a sock…and buttons off his shirt. A woman holding a baby was sucked through a broken convenience store window… But was unhurt. A dog…tethered to the ground by its leash… Was suspended in the air by the twister. Uprooted trees crushed cars and damaged curbs and sidewalks. People in downtown Denver could see three tornadoes occurring simultaneously. Hail as large as 1 3/8 inches in diameter fell in extreme southeast Aurora.

In 1997…a tornado touched down briefly at the Colorado National Speedway near Dacono north of Denver. The tornado ripped through the south grandstand causing at least 50 thousand dollars in damage to a shed…kiosk… Bleachers…and several concession stands.

In 2004…a tornado touched down briefly near Castle Rock and blew the roof off a machine shop. A tornado near Elizabeth destroyed a barn and caused roof damage to a home. Two other barns on nearby properties were damaged extensively. The twister also caused widespread tree damage in the area. A tornado also touched down near Bennett and Strasburg…but did no damage.

In 2009…thunderstorm winds knocked a tree on to two vehicles in Boulder. One of the drivers was injured when the tree smashed into the windshield of her car.

In 2012…a severe thunderstorm produced hail from quarter to half dollar size near Littleton and Highlands Ranch. A weak short lived tornado (ef0) also touched down near Bennett.

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In 1963…heavy rain and hail ravaged metro Denver. In southeast Denver…heavy rain flooded homes and streets. Hail to a depth of 4 inches on the ground stripped trees and plants and drifted to depths of 3 to 4 feet in some areas. Flood waters on the valley highway were 19 feet deep in places…trapping many cars. Many creeks were running over their banks. On the 15th…the main thunderstorm cell passed over south Denver…dumping as much as 4 inches of rain in 90 minutes. Precipitation at Stapleton Airport totaled 0.91 inch on the 15th and 1.31 inches on the 16th. A funnel cloud was sighted briefly 4 miles to the south-southeast of Stapleton Airport on the 15th. Damage from hail and flooding amounted to near a million dollars.

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In 1950…very heavy rain and hail storms in southwest Denver caused an estimated 750 thousand dollars in hail and flood damage. Thunderstorms produced 2.06 inches of rain at Stapleton Airport with 2.23 inches of rain measured in downtown Denver.

In 1965…a tornado…15 miles south-southeast of Denver… Touched down and damaged two houses in northern Douglas County. Three golfers at a country club and a women who lived north of Castle Rock were injured by falling structures.

In 1983…a microburst wind gust to 54 mph was recorded at Stapleton International Airport.

In 1984…a tornado touched down briefly in Parker. No damage was reported.

In 1986…lightning injured 5 people just north of the Denver city limits in Adams County. The victims were members of a drum and bugle corps and were standing near a metal scaffold. Heavy rain from the storm also caused street flooding in the metro area.

In 1991…hail to golf ball size fell at Conifer.

In 1992…a rare mid-June high wind event wreaked havoc over metro Denver when a pacific cold front moved across the Rocky Mountains. Strong winds at speeds of 40 to 50 mph were common along the Front Range foothills. Winds reaching 107 mph in the foothills west of Denver and 79 mph at Longmont…caused damage ranging from trees being toppled to large trucks being rolled over. Strong winds estimated at 75 mph rolled a 35-foot truck carrying building supplies on U.S. Highway 36 north of Boulder. The truck driver and a passenger as well as the driver of another car were slightly injured. The winds downed power lines. The gambling towns of central city and Blackhawk were without power for a couple of hours. West winds reached 43 mph at Stapleton International Airport.

In 1996…a small tornado touched down in the foothills southwest of Boulder near Pinecliffe…knocking down 50 to 100 large pine trees. A house nearby sustained damage when shingles were ripped from the roof. The tornado also picked up a 17-foot sailboat with attached trailer and carried it 25 feet into a nearby tree. In addition… Thunderstorm wind gusts to 46 mph were measured at Denver International Airport.

In 2004…hail as large as 1 inch in diameter fell near Castle Rock. Hail to 3/4 inch was measured near Bennett.

In 2005…severe thunderstorms produced hail as large as 1 inch in diameter in Centennial.

In 2011…severe thunderstorms produced and damaging across parts of metropolitan Denver. In Lakewood…a tree blew down and landed on at least five cars. At Centennial Airport…a section of a roof on a hangar was ripped off the strong winds. A peak wind gust of 46 mph was recorded at Centennial Airport and Denver International Airport in the evening.

Continue reading June 15 to June 21: This Week in Denver Weather History →

June is the month of the year when Colorado receives the majority of its severe weather and that is seen in our look back at this week in Denver weather history. Also notable are several historical wildfires, including the Hayman blaze.

From the National Weather Service:

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In 2012…it was the hottest June in Denver since weather records began back in 1872. The average temperature for the month was 75.0 degrees which was 7.6 degrees above normal. There were a total of seventeen 90 degree days in the month of June. The highlight of record setting month was a stretch of five consecutive 100 degree days from the 22nd to the 26th. This was only the third time in Denver weather history in which this happened. Two of the high temperatures during the stretch peaked at 105 degrees… Which set the all-time record for the month of June and tied the all-time maximum temperature for Denver.

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In 1979…rain…at times with thunder on the 7th…fell almost continuously through the morning of the 9th. Rainfall totaled 2.28 inches at Stapleton International Airport over the 3 days. High temperature of only 49 degrees on the 8th was a record low maximum for the date.

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In 1873…lightning struck and killed one man and damaged several houses. The thunderstorms produced heavy rain in the city…which caused a great deal of water damage. At 2:40 pm heavy rain began and by 4:00 pm 1.40 inches of rain had fallen. Two buildings under construction…with a projected cost of 100 thousand dollars…were badly damaged. The stone foundation and some of the brick walls were carried away by the storm waters. Many basements were flooded…which damaged goods stored there. Rainfall totaled 1.71 inches.

In 1964…lightning struck a building in Boulder…starting a fire and burning two workmen.

In 1968…a severe thunderstorm flooded streets…and hail- damaged trees and gardens…including flowers at a large commercial nursery in Boulder.

In 1969…severe hail damaged property…trees…and gardens… And heavy rain flooded streets and underpasses throughout metro Denver. The heaviest amounts of rain fell in south Denver and Englewood where unofficial totals of 5 to 6 inches were reported. Hail accumulated to 3 or 4 inches on the level and 2 to 3 feet deep in drifts. Mud…debris…and hail carried by the heavy runoff clogged drains and increased the amount of flooding. About 40 cars and a large truck were inundated at an underpass on an interstate highway…and several more were inundated or buried in mud in other areas. A large number of basements were flooded. Streets and highways were heavily damaged in some areas. Rainfall totaled 1.66 inches at Stapleton International Airport.

In 1974…a late spring storm dumped 1.79 inches of rain over metro Denver…causing local flooding. Strong gusty winds accompanied the storm…downing some power and telephone lines. Northwest winds gusted to 56 mph at Stapleton International Airport where a trace of snow fell. Measurable snowfall occurred at mid-day over Aurora and suburban areas to the south of Denver. A number of people were temporarily stranded in the mountains west of Denver where heavy snow fell. Low temperature of 37 degrees equaled the record minimum for the date. High temperature of 50 degrees was a record low maximum for the date.

In 1986…strong thunderstorm winds blew down a garage wall in Littleton and caused minor roof damage to several homes. Boats were overturned and damaged at a sporting goods store nearby. As the storm moved northeast it produced a small tornado…which touched down in extreme southeast Denver and moved northeast into Aurora. The twister did most of its estimated one million dollars damage shortly after touching down in an apartment complex and a shopping center. Two apartments were completely unroofed; wooden chimney facings were demolished and metal pipes were twisted. Many trees up to 25 feet high in the complex were uprooted. Doors were ripped off their hinges…and several parked cars were damaged. In the shopping center…a wall of a building was stripped of its brick facing…and many windows were broken. The twister picked up an aluminum rowboat…carried it 250 feet over some apartments…and deposited it in a vacant storefront. Around 200 cars were damaged in the shopping center. Benches bolted to the pavement were knocked over. Six people suffered minor injuries caused by flying debris. After hitting the shopping center and apartment complex…the tornado moved northeast into a residential area where it toppled some trees and damaged several fences. The same storm later produced 3 separate small tornadoes 5 miles north of Watkins.

In 1987…torrential rain produced extensive flooding across metro Denver. I-25 was closed for a time through central Denver…and a trailer park in Lakewood was partially evacuated due to high water. Several streets in Boulder were closed due to flooding. There was extensive basement flooding and water damage in Lakewood and southeast Denver. Lightning hit a power plant in Denver that supplied electricity to storm drain pumps which exacerbated street flooding in some areas. Rainfall from the thunderstorms totaled 1 1/2 to 2 inches at many locations in Lakewood central and northeast Denver. The heaviest amount of reported rain was in Lakewood where 2 1/4 inches fell in just 2 hours. At Stapleton International Airport…1.62 inches of rain fell in an hour. Rainfall totaled 1.76 inches for the day.

In 1988…a tornado touched down 15 miles northwest of Bennett and stayed on the ground for 15 minutes. The twister was observed by national weather service personnel at Stapleton International Airport. No damage was reported.

In 1989…a small tornado hit a neighborhood in southeast Aurora. The twister hit a dozen homes…blowing out windows…knocking down fences…and partially unroofing one house. About a half dozen trees were felled. A basketball pole was severely bent. The tornado was on the ground for about 2 minutes. Total damage was estimated at 50 thousand dollars. Lightning also struck a home in Parker…causing 25 hundred dollars damage.

In 1992…very heavy thunderstorm rains drenched southwestern weld and eastern Boulder counties. Measured rainfalls of over 2 inches an hour caused St. Vrain Creek to rise 2 feet out of its banks. Boulder creek was also out of its banks along U.S. Highway 287. I-25 flooded with 3 to 5 feet of water along a 9-mile stretch from the Erie exit to the Frederick exit. The highway was closed for over 6 hours while snowplow drivers and farmers with tractors rescued stranded motorists. Water rose into homes along south Boulder road in Lafayette. Several small county roads were washed out along the Boulder County/Weld County line. An off-duty National Weather Service employee measured 3/4 inch hail in Thornton. Several locations north of Denver had small hail up to 6 inches deep. A funnel cloud was spotted 18 miles northeast of Stapleton International Airport.

In 1998…severe thunderstorms dropped large hail across metro Denver. Hail as large as 1 3/4 inches in diameter fell near columbine in Jefferson County. One inch diameter hail fell in Aurora and Littleton with 7/8 inch hail in Arvada and 3/4 inch hail at Centennial Airport… Near greenwood village…and in Parker.

In 2004…heavy rain and large hail caused flooding and flash flooding across northeast Jefferson County. In Golden… Heavy rains triggered a small mudslide on U.S. Highway 6 near the intersection of Colorado highway 119. Automated rain gages in the area registered 2 to 3 inches of rainfall in one hour. Near the Colorado Mills mall…numerous streets were inundated with 1 to 3 feet of water and hail…which stranded several vehicles…including a fire engine. About 30 basements were flooded in Golden and Lakewood. Many windows in both homes and cars were shattered by the large hail. Hail as large as 1.5 inches in diameter was measured in and near Golden with hail to nearly an inch in diameter a few miles north of Evergreen.

In 2007…the low temperature in Denver bottomed out at 31 degrees…which established a new record minimum for the date. It also became the latest date of the last freeze in Denver.

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In 1900…an apparent cold front produced north winds to 42 mph with gusts to 47 mph.

In 1923…heavy rainfall totaled 2.18 inches in downtown Denver…where northwest winds were sustained to 27 mph. Heavy rain also fell in Boulder…causing flooding on Boulder and south Boulder creeks.

In 1939…post-frontal sustained northwest winds to 35 mph produced some blowing dust…which reduced the visibility to one mile at times during the afternoon. Dusty conditions prevailed into the early evening. The airport station reported a maximum wind of 56 mph. A few minor injuries and some damage resulted. A few trees were uprooted…some fruit was blown from trees…and a section of power lines was blown down.

In 1959…dry thunderstorm winds…estimated to near 70 mph… Toppled a 40-foot-high poplar tree…which was 4 to 5 inches in diameter…near Cherry Creek dam. The Colorado state patrol reported a possible tornado 1 mile south of the dam.

In 1960…strong gusty winds tore the roofs from 2 patios in Aurora. One of the roofs was blown over a house and landed on a car damaging its top. A house trailer was also overturned. Other minor damage was reported to roofs… Windows…and trees in Aurora. A thunderstorm wind gust to 43 mph was recorded at Stapleton Airport.

In 1963…golf ball size hail fell at Cheery Creek Reservoir.

In 1967…a small tornado damaged trees and a dwelling in south Denver. The storm touched down at the intersection of 1st avenue and Harrison Street and moved northeast to the intersection of 3rd avenue and Albion Street. Damage included 3 small roofs removed…15-20 large trees uprooted…one car overturned and thrown against a house… Plus other minor damage. A funnel cloud reported at the same time 10 miles north of Denver possibly touched ground. Later…funnel clouds were reported 12 miles south-southeast of Stapleton International Airport…10 miles southwest…and 5 miles north. A tornado was sighted 3 1/2 miles east of Stapleton International Airport by weather bureau personnel for a duration of 5 minutes. Heavy rain and some hail fell over much of the area.

In 1974…the start of the shortest seasonal snow free period on record…94 days…occurred with the last snow of the season…a trace…on the 8th. The first snow of the next season occurred on September 11th when a trace of snow fell at Stapleton International Airport. A funnel cloud was observed just east of Aurora and a small funnel was sighted just northeast of Stapleton International Airport.

In 1985…a thunderstorm wind gust to 62 mph was reported at Golden Gate Canyon in the foothills west of Denver.

In 1986…a thunderstorm…which dumped heavy rain and caused some street flooding across north metro Denver…produced a small tornado 5 miles east of Brighton. No damage was reported.

In 1987…strong thunderstorm wind gusts in Conifer destroyed a porch on a house; the wind gust apparently picked up the porch and dropped it on a man…killing him. The wind also damaged the roof of the house and a nearby barn. The same thunderstorm spawned a tornado…which touched down briefly just south of Lakewood. No damage was reported. Up to 3 inches of rain fell in a short time 8 miles southwest of Littleton. A few businesses in Englewood suffered minor water damage. A tornado was sighted between Watkins and Bennett. It was on the ground for 15 minutes. A weak tornado also touched down 4 miles southwest of Castle Rock. The twister tossed an aluminum shed into the air and carried it about 100 feet. A funnel cloud was sighted 15 miles east-northeast of Stapleton International Airport.

In 1988…golf ball size hail fell in Conifer along with 1.30 inches of rain. Three miles north of Louisville…1.10 inches of rain fell in 20 minutes. Ping pong ball size hail was measured in Arvada.

In 1990…3/4 inch hail fell in Castle Rock.

In 1991…hail two inches in diameter fell near Evergreen. Hail to 1 inch diameter fell in Lakewood where a funnel cloud was also sighted. One inch diameter hail was also reported in Aurora.

In 2002…high temperatures…low relative humidities…and strong gusty winds allowed the Hayman wildfire…located in the foothills to the southwest of Denver…to become the largest wildfire in the state’s history. Although the fire was initially started by a U.S. Forest Service employee…the ongoing drought and dry conditions allowed the fire to spread rapidly out of control. The wildfire consumed nearly 138 thousand acres of forest land and 133 homes before it could be contained and finally extinguished on June 30th. About 1800 households had to be evacuated during the blaze. Southwest winds aloft swept the smoke plume directly over metro Denver…creating poor air quality and blocking the sun. Much of metro Denver choked on smoke with the southern suburbs receiving the most. Smoke and ash restricted surface visibilities to a mile or less at times in the Denver and Castle Rock areas and to 2 miles at Denver International Airport.

In 2003…thunderstorm winds gusted to 51 mph at Denver International Airport. The storm produced only a trace of rain.

In 2004…severe thunderstorms produced large hail across portions of metro Denver for the second day in a row. The most extensive damage occurred across southern sections of metro Denver in Aurora…Lakewood…Littleton…and south Denver. The combined damage to homes and vehicles…not including commercial buildings…was estimated at 146.5 million dollars…making the event the 4th costliest insurance disaster in the state’s history. Hail as large as 2 1/4 inches in diameter fell near southern Aurora with hail to 1 3/4 inches in the city of Denver and in Lakewood. Hail to 1 1/2 inches fell near Morrison with 1 inch hail measured in Thornton…near Buckley Air Force Base…and near Roggen. Hail to 3/4 inch diameter fell in Littleton and near Conifer. A small tornado touched down near Bennett…but did no damage.

Continue reading June 8 to June 14: This Week in Denver Weather History →

Severe weather is usually the hallmark of mid to late spring weather and our look back at this week features the types of events that make this ring true. Numerous cases of flooding rains, damaging hail and tornadoes are seen. Most notably is the infamous June 3, 1981 tornado in Thornton.

From the National Weather Service:

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In 1894…heavy rain combined with snowmelt runoff caused widespread flooding over the South Platte River basin. Rainfall was heaviest in the foothills where 5 to 8 inches were measured over the 4 days. Heavy rainfall west of Boulder flooded mining towns and damaged mining properties. In the canyons above Boulder…railroads and roads were washed out along with many bridges. The floodwaters spread into central Boulder and covered a wide area from University Hill north to near Mapleton Hill to a maximum depth of 8 feet. Many houses were swept away…and every bridge in Boulder was destroyed. A few people…trapped in their homes by the floodwaters… Had to be rescued. However…the gradual rise of the flood waters resulted in only one death. Boulder Creek spread to a width of nearly one mile in the pasture land to the east of Boulder. Extensive flooding on Left Hand Creek north of Boulder washed away railroad and wagon bridges. The heavy cloudbursts caused flooding on bear creek…which washed away bridges…railroad tracks…and structures and destroyed the canyon roadway. Morrison sustained the heaviest flood damage on Bear Creek. In Denver…rainfall totaled only 1.50 inches on the 30th and 31st…but the heavy rainfall on upstream tributaries of the South Platte River caused the river to rise as much as 10 feet above the low water mark in the city…which caused some flooding of pasture land downstream to a depth of 6 feet near Brighton.

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In 1875…a windstorm during the late afternoon and early evening produced sustained winds to 50 mph.

In 1898…south winds were sustained to 41 mph with gusts to 46 mph.

In 1917…a trace of unmelted snow fell in downtown Denver. Precipitation for the day totaled 0.08 inch…half of which was estimated to be from melted snow.

In 1919…snowfall of 0.4 inch was measured in downtown Denver. This was the greatest calendar day and 24-hour snowfall ever recorded during the month of June. Precipitation (rain and melted snow) totaled 0.15 inch. Two temperature records were set. The low temperature of 32 degrees was a record minimum for the date. The high temperature of only 40 degrees was a record low maximum for the date and the month. North winds were sustained to 36 mph with gusts to 40 mph.

In 1951…a trace of snow fell at Stapleton Airport.

In 1961…hail as large as 1 1/2 inches in diameter fell in west Denver with hail to 1 1/4 inches reported in derby.

In 1965…a man struck by lightning in southeast Denver died shortly after being admitted to a hospital. Lightning damaged power lines in east and southeast Denver.

In 1980…strong thunderstorm winds blew in the windows of a mobile home in Northglenn.

In 1990…a thunderstorm produced wind gusts to 63 mph in Boulder. A small tornado touched down in a farmer’s field between the towns of Louisville and Lafayette. Another tornado was spotted in an open field 3 miles west of Brighton. A funnel cloud was sighted near Hudson. A microburst wind gust to 55 mph was recorded at Stapleton International Airport. No damage was reported from any of these events.

In 1991…severe thunderstorms producing large hail…damaging winds…funnel clouds…and heavy rain were widespread across metro Denver. Funnel clouds were reported in Lakewood… Boulder…Arvada…and just east of the rocky mountain arsenal. Hail up to golf ball size fell in Lakewood…just west of Sedalia…in Littleton…Arvada…Englewood…and the city of Denver. A mobile home park in Jefferson County reported hail to 3 feet deep. Up to 1.00 inch of rain fell in 45 minutes near Boulder…causing Boulder creek to flow out of its banks. Rock and mud slides forced the closure of many roads in Boulder County. Later in the afternoon thunderstorms produced rainfall amounts of 2 to 3 inches over a couple of hours. Clear creek in Golden spilled over onto U.S. Highway 6. Heavy rains washed away part of a bridge near Erie. Water was up to 18 inches deep in Westminster. Wind gusts to 58 mph were reported at Stapleton International Airport where 1/4 inch hail fell… And heavy thunderstorm rainfall totaled 0.82 inches…briefly reducing the visibility to 1 1/4 miles. Estimates of total damage from these storms would exceed 7 million dollars.

In 1994…hail up to 1 inch in diameter fell over south Denver and Littleton.

In 1997…two short lived-tornadoes formed near Bennett…but did no reported damage.

In 2002…strong winds from the outflow of dissipating showers developed to the east of Denver. Near Strasburg…a spotter recorded a wind gust to 58 mph.

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In 2002…unusually very warm weather for so early in June resulted in two temperature records. Maximum temperatures of 96 degrees on the 1st and 93 degrees on the 2nd were record highs for each date…respectively.

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In 1977…unusually warm weather for this early in June resulted in 3 maximum temperature records being equaled at the time: 88 degrees on the 1st…90 degrees on the 2nd… And 93 degrees on the 4th. Maximum of 91 degrees on the 3rd was not a record.

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In 2012…it was the hottest June in Denver since weather records began back in 1872. The average temperature for the month was 75.0 degrees which was 7.6 degrees above normal. There were a total of seventeen 90 degree days in the month of June. The highlight of record setting month was a stretch of five consecutive 100 degree days from the 22nd to the 26th. This was only the third time in Denver weather history in which this happened. Two of the high temperatures during the stretch peaked at 105 degrees… Which set the all-time record for the month of June and tied the all-time maximum temperature for Denver.

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In 1914…flooding occurred on Boulder creek when heavy rains added to heavy snowmelt runoff. Flooding damaged the water supply system from the mountains into Boulder and destroyed roads and bridges in the canyons above Boulder. The flooding in central Boulder was described as the worst since the tragic flood of May 29th through June 3rd in 1894. However…there was no reported loss of life. The flood waters also inundated pasture land to the east of the town.

In 1951…the lowest recorded temperature in June…30 degrees… Occurred. The unusually cold weather was accompanied by 0.3 inch of snowfall. Precipitation…both rain and melted snow…totaled 0.30 inch.

In 1966…microburst winds gusted to 51 mph at Stapleton International Airport.

In 1981…a severe thunderstorm roared through metro Denver… Dumping 2.00 inches of rain in as little as 20 minutes and bombing many areas with hail to 1 3/4 inches in diameter. The heavy rain caused local flooding with up to 3 feet of water in some streets in northwest metro Denver. Part of a street was washed out in Thornton. Lightning strikes started a fire and caused a power outage just north of Denver. Lightning also struck a barn which burned to the ground in Brighton. Numerous cars sustained minor hail damage. A tornado was spotted 4 miles northeast of the rocky mountain arsenal…but caused no damage.

In 1982…severe thunderstorms produced large hail across metro Denver. Hail to 3/4 inch in diameter was reported in Louisville and northeast Denver. Golf ball size hail fell near Strasburg where two tornadoes were also sighted.

In 1983…a tornado touched down 5 miles south of Bennett. It destroyed an outbuilding and did extensive damage to greyhound dog shelters. Golf ball size hail fell near the tornado…destroying some hay.

In 1985…3/4 inch hail fell in southwest metro Denver.

In 1989…large hail fell over eastern and central Denver. A few stones were as large as baseballs…and many ranged from 3/4 inch to golf ball size. The hail piled up 2 to 4 inches deep in some areas. Hail to 3/4 inch fell at Buckley Field in Aurora…and 7/8 inch hail fell just east of Aurora. A home in Louisville was struck by lightning and was 30 percent destroyed by the ensuing fire.

In 1991…strong thunderstorm winds in Arapahoe County…14 miles southeast of Stapleton International Airport…damaged the roof of a home and a radio antenna. A funnel cloud… 4 miles northeast of Stapleton International Airport…was sighted for 11 minutes by national weather service observers.

In 1993…a tornado touched down briefly in south Denver… Destroying the 4-inch thick concrete roof of a building and causing about 20 thousand dollars in damage. The twister also picked up a trash dumpster and dropped it onto a car 30 feet away…causing an estimated 3 thousand dollars in damage. Hail up to an inch in diameter fell in Aurora… Conifer…and Bennett. Two funnel clouds were spotted near Deckers. A funnel cloud was sighted for 19 minutes by national weather service observers to the southwest of Stapleton International Airport.

In 1994…lightning struck two homes in Denver…starting fires which caused considerable damage to both. Hail to 3/4 inch in diameter fell in Golden.

In 1995…lightning struck a house in Nederland…causing a fire that was doused by subsequent rainfall. A portion of the roof and wall was damaged. The storm also left most of Nederland without power for two hours. Lightning also struck a high chimney of an elementary school in west Denver. The jolt sprayed bricks around the school yard and parking lot. Twenty students and teachers were in the school building at the time…but all escaped without injury. A funnel cloud was sighted over Fort Lupton…and 3/4 inch hail fell in Lafayette.

In 2003…severe thunderstorms produced strong winds and large hail. Hail as large as 1 1/2 inches in diameter fell near Parker. Estimated wind gusts to 70 mph occurred near Parker and near Denver International Airport where thunderstorm wind gusts to 52 mph were recorded. Wind gusts to 60 mph were estimated near Bennett.

In 2005…a severe thunderstorm produced hail as large as 1 inch in diameter in the city of Denver. A tornado was sighted near Bennett along with 3/4 inch hail.

In 2008…severe thunderstorms produced large hail over western Arapahoe…northern Denver and southern weld counties. Hail…2 inches in diameter…was observed near Brighton; with hail to 1 1/2 inches in diameter…5 miles east of prospect. Hail to one inch in diameter was observed near Buckley Field…Frederick and Denver.

In 2012…severe thunderstorm produced damaging thunderstorm winds. Peak wind gusts included: 82 mph near Strasburg… 61 mph at Buckley Field…60 mph near byers and southwest Denver…58 mph near Watkins and 52 mph at Denver International Airport. The microburst winds caused extensive tree and roof damage. In addition…hail up to 1 inch in diameter was reported 3 miles east-southeast of Parker.

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In 1989…heavy rain drenched metro Denver with the greatest amounts recorded on the 3rd. Total rainfall ranged from 1 1/2 to 3 inches. Roads were washed out in Boulder County… And flooded basements caused water damage to houses in the Gunbarrel section of Boulder. In suburban Denver…heavy rain caused minor flooding along Lena Gulch in Jefferson County where two mobile home parks were evacuated. Rainfall totaled 1.66 inches at Stapleton International Airport.

Continue reading June 1 to June 7: This Week in Denver Weather History →