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The Mississippi River is flooding in a big way right now, at the wrong time of year, and is forecasted to match or break 22-year-old crest records over the next few days. Meteorologists are calling it “insane.” Over the next three to four days, the Mississippi is predicted to reach a crest height of 49.7 feet… Continue reading Mississippi River is About to Have a Record Flood |
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Worst floods for 70 years swamp northern England
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Parts of northern England are suffering their worst floods in more than 70 years with weeks of heavy rain leaving vast areas under water on both sides of the Pennines mountains. British Prime Minister David Cameron has sent in 500 soldiers to help the exhausted residents and emergency workers. A further 1,000 troops remain on standby.… Continue reading Worst floods for 70 years swamp northern England |
Texas tornado’s winds topped 200 mph; 11 dead in storms
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A tornado that blew through Garland, Texas, killing eight people Saturday night has been classified as an EF4, with winds up to 200 mph. It was one of two confirmed tornadoes that tore through North Texas in a storm that killed 11 people, including an infant. The National Weather Service confirmed that the tornado that touched… Continue reading Texas tornado’s winds topped 200 mph; 11 dead in storms |
December 27 to January 2: This week in Denver weather history
Snow and wind are the two dominant weather conditions seen on our look back at this week in Denver weather history. Nine years ago, the second of two major winter storms buried Denver and closed highways. Eight years ago, damaging winds that downed trees and caused power outages occurred.
25-31
In 1980…temperatures were unusually warm during the week between Christmas and new year’s. High temperatures for the week ranged from the mid-50’s to the mid-70’s. Four temperature records were set. Record highs occurred on the 26th with 68 degrees…the 27th with 75 degrees…and the 30th with 71 degrees. A record high minimum temperature of 41 degrees occurred on the 27th.
26-27
In 1954…a major storm dumped heavy snow across metro Denver. Snowfall totaled 8.6 inches at Stapleton Airport. The storm produced the heaviest snowfall of the calendar year and was the only measurable snowfall in December.
In 1987…a snowstorm stalled in northeastern Colorado…giving metro Denver its worst winter storm in 4 years. Total snowfall from the storm ranged from 12 to 18 inches on the east side…1 to 2 feet in Boulder County…and 2 to 3 feet in western and southern parts of metro Denver. The largest reported snowfall was 42 inches at Intercanyon in the foothills southwest of Denver. Snowfall totaled 14.9 inches at Stapleton International Airport. Winds were light on the 26th…but increased as high as 40 mph on the 27th… Creating near-blizzard conditions and forcing complete closure of Stapleton International Airport for about 8 hours. The strong winds whipped drifts to 5 feet high on the east side of town. All interstate Highways leading from Denver were closed on the 27th.
26-28
In 1979 a heavy snow storm dumped 6 to 10 inches of snow over the metro area and 15 to 20 inches at Boulder with up to 2 feet in the foothills west of Boulder. Heavy snowfall totaled 6.0 inches at Stapleton International Airport where north winds gusted to 21 mph. Most of the snow… 4.8 inches…fell on the 27th.
27
In 1895…west Chinook winds sustained to 44 mph with gusts to 48 mph warmed the temperature to a high of 52 degrees.
In 1901…an apparent cold front produced sustained north winds to 41 mph with gusts to 48 mph.
In 1957…northwest winds gusting to 52 mph produced some blowing dust across metro Denver.
In 1975…a northwest wind gust to 53 mph was recorded at Stapleton International Airport.
In 1976…a strong pacific cold front moving across metro Denver produced a northwest wind gust to 53 mph at Stapleton International Airport.
In 1990…high winds raked the eastern foothills with a wind gust to 84 mph clocked on fritz peak near Rollinsville. The strong northwest winds of 50 to 70 mph whipped newly fallen snow over higher areas into billowy clouds several hundred feet high that could be seen from most locations across metro Denver.
In 1996…another round of high winds developed over portions of the Front Range foothills during the morning hours. Several wind gusts from 70 to 100 mph were reported at Wondervu southwest of Boulder. West-northwest winds gusted to 38 mph at Denver International Airport.
In 2005…a trained weather observer in Georgetown recorded a wind gust to 94 mph. No damage was reported.
In 2007…a winter storm brought heavy snow to portions of the urban corridor and adjacent plains. Storm totals generally ranged from 3 to 7 inches. Locally heavier bands produced up to 10 inches of snow. In the urban corridor…storm totals included: 10 inches…10 miles south-southeast of Buckley AFB and at Castle Pines; 9.5 inches…4 miles south-southeast of Aurora and Kassler; 7.5 inches…2 miles southeast of Highlands Ranch; 7 inches in Aurora and Sedalia; 6.5 inches in Arvada…4 miles east of Denver and Lafayette; 6 inches in Castle Rock and Thornton. A measurement of 5.4 inches was taken at the former Stapleton International Airport. The official total for the month was 20.9 inches; making it the 6th snowiest December on record.
27-28
In 1997…high winds combined with fresh snow from a previous storm caused highways to become slick from drifting snow and near whiteout conditions in localized ground blizzards. Strong winds blew snow across the runways at centennial airport…which glazed over and formed areas of ice. Two planes were damaged when they slid off the runway while landing. No injuries were reported. Numerous accidents also occurred on I-25 and I-70 as ice formed under the same conditions. A rollover accident which injured 4 people on State Highway 93 near the Rocky Flats Environmental Test Facility was also attributed to the high winds. The high winds caused an office building and showroom under construction in Golden to collapse. The largest wall was 180 feet long and 28 feet high. Some high wind reports included: 86 mph at Golden Gate Canyon…72 mph near Conifer…and 70 mph at Jefferson County airport and the National Center for Atmospheric Research on the mesa near Boulder. West-northwest winds gusted to 53 mph at Denver International Airport on the 27th.
In 1998…damaging downslope winds formed in and near the foothills. Peak wind gusts ranged from 71 to 114 mph. Numerous trees were blown down in Coal Creek Canyon and near gross reservoir. Power lines were blown down… Resulting in scattered outages. Peak wind reports included: 114 mph at Wondervu…92 mph in Golden Gate Canyon…88 mph in Coal Creek Canyon…and 79 mph 8 miles west of Conifer. West winds gusted to 46 mph at Denver International Airport on the 28th.
27-29
In 1983…a second surge of bitter cold air in less than a week was less intense. Record breaking low temperatures of 12 degrees below zero on the 28th and 15 degrees below zero on the 29th were accompanied by 3.7 inches of snowfall and northeast winds gusting to 23 mph.
28
In 2001…brief high winds developed in the foothills west of Denver. Winds gusted to 86 mph on Fritz Peak near Rollinsville. West to northwest winds gusted to 39 mph at Denver International Airport where the temperature climbed to a high of 51 degrees.
28-29
In 1906…a trace of snow fell on both days…which along with a trace of snow on the 5th…was the only snow of the month…ranking the month the second least snowiest December on record.
In 1970…wind gusts to 87 mph were recorded at the National Center for Atmospheric Research in Boulder. Winds gusted to only 46 mph in downtown Boulder. Damage was minor.
In 2006…while metro Denver residents were still digging out from the heavy snowfall and blizzard that occurred on December 20-21…the second major winter storm in a week buried the city and the eastern foothills again in more deep snow. Heavy snowfall ranged from 1 to 2 1/2 feet in the foothills and from 6 to 18 inches across the city. Another slow moving storm system centered over the Texas panhandle produced deep upslope flow over the high plains and against the Front Range mountains. The storm produced blizzard conditions over the plains mainly south of interstate 76. Interstate 70 as well as other roads and highways was closed from Denver to the Kansas line due to snow and blizzard conditions. Greyhound was forced to cancel all bus trips from Denver. The heaviest snow fell in and near the foothills and south of Denver over the palmer divide…where north winds sustained at speeds of 20 to 30 mph with gusts to 40 mph piled the snow into drifts 4 to 14 feet deep. In the city…the heavy snowfall persisted for a total of 29 hours. Snowfall totals across metro Denver included: 17.5 inches at Ken Caryl; 15 inches 3 miles south-southeast of Morrison; 14 inches in Boulder and Lone Tree; 12 inches in Castle Rock and Highlands Ranch; 11 inches in Wheat Ridge; 10.5 inches in Littleton; 10 inches in Arvada…Broomfield…and Louviers; and 8.5 inches in Lakewood and Thornton. Officially…snowfall totaled 8.0 inches at Denver Stapleton. North winds sustained to 25 mph with gusts to 32 mph produced some blowing snow at Denver International Airport. In the city…this second storm increased the total snowfall for the month to 29.4 inches…making the month the third snowiest on record. In the foothills the snow fell at a rate of 3 to 4 inches an hour at times. Total snowfall in the foothills included: 30 inches near Genesee; 29.5 inches 12 miles northwest of Golden; 25 inches in Evergreen and near Bergen Park; 24 inches near Conifer; 23.5 inches 3 miles southwest of Golden and near Gold Hill; 23 inches near Jamestown; 22.5 inches in Rollinsville; 19.5 inches in Aspen Springs; 19 inches near Blackhawk; 18.5 inches at Nederland; 16 inches in Indian Hills…at Intercanyon…and in Eldora; 15.5 inches at Echo Lake; and 12 inches near Ralston Reservoir. The total cost of snow removal just at Denver International Airport from this storm and the previous storm was in tens of millions of dollars. The airport estimated up to 6.7 million dollars in extra costs for contractors…overtime…equipment…de-icing chemicals…and other expenses. The two storms cost the airport 4.6 million dollars in loss concession revenues. United airlines reported lost revenue of over 25 million dollars from the two storms…while frontier airlines lost an estimated 12.1 million dollars.
29
In 1997…high winds persisted mainly in and near the foothills. Strong cross winds gusting between 60 and 70 mph blew a rental truck off the roadway in northern Jefferson County near the Coal Creek Canyon road. West winds gusted to 33 mph at Denver International Airport.
In 2005…high winds were recorded across metro Denver. Peak wind gusts included 75 mph near Chatfield Reservoir and 64 mph at Denver International Airport. No damage was reported.
29-30
In 1898…heavy snowfall totaled 6.2 inches in downtown Denver. Northeast winds were sustained to 35 mph with gusts to 40 mph on the 29th.
In 1912…strong winds buffeted Boulder…causing hundreds of dollars damage. The winds were described as one of the most terrific in the history of the city.
In 1923…a cold wave caused temperatures to plunge 58 degrees in 24 hours. The temperature was 54 degrees at 2:00 pm on the 29th and only 4 degrees below zero at the same time on the 30th. The low temperature of 14 degrees on the 29th was the high temperature on the 30th. The low temperature on the 30th dipped to 10 degrees below zero. Light snowfall totaled only 0.7 inch. Northeast winds were sustained to 23 mph on the 29th.
In 2008…very strong Chinook winds blasted areas in and near the foothills of Boulder and Jefferson counties. The wind blew down trees and power poles…downed electrical lines and fences…and damaged homes and vehicles. Scattered power outages were reported along the Front Range. In metropolitan Denver alone…24…000 Xcel customers were affected by the outages. Four planed were damaged at the Vance Brand Municipal Airport in Longmont…one was heavily damaged. Insurance companies estimated up to 7 million dollars in damage. Peak wind gusts included 87 mph at the National Wind Technology Center…86 mph…2 miles north of Longmont; 77 mph at Erie…and 75 mph at Lafayette. On the 30th…a peak wind gust to 47 mph was recorded at Denver International Airport.
Continue reading December 27 to January 2: This week in Denver weather history
Santa’s journey begins, live tracking online
Santa Claus begins his whirlwind trip around the globe tonight to deliver toys to all the good little boys and girls! For more than 50 years the North American Aerospace Defense Command (NORAD) has tracked Kris Kringle on Christmas Eve and helped to ensure he completes his journey safely.
ThorntonWeather.com is pleased to be able to provide live Santa tracking from NORAD right here on our site!
Click here to check it out and be sure to come back often to see where Kris Kringle is at!
Below is the official 2014 NORAD Tracks Santa trailer.
Dreaming of a white Christmas in Denver? Odds are not historically that great
As Christmas gets closer everyone always wonders if we are going to get the proverbial white Christmas. Unfortunately, if you look at Denver and Thornton weather history, the chances aren’t all that good but it also depends on what you define as a white Christmas.
If to you a white Christmas means having actual snowfall on Christmas Day the chances aren’t that good. But, if simply having snow on the ground suffices, the chances improve considerably.
For a complete look at Denver’s Christmas weather statistics, click here.
For the latest Thornton weather forecast for Christmas, check out our forecast page.
2015 brings first Christmas full moon in 38 years
Christmas 2015 will feature the holiday’s first full moon in 38 years and December 25 won’t see another for 19 more years. The last Christmas full moon occurred in 1977, the next won’t come until 2034.
The Full Cold Moon, as December’s full moon is called, will occur at 4:11am MST early Christmas morning.
According to the Old Farmer’s Almanac, “This is the month when the winter cold fastens its grip and the nights become long and dark. This full Moon is also called the Long Nights Moon by some Native American tribes.”
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Astronomical winter begins with the winter solstice on Monday
Astronomical winter arrives in Thornton tonight and with the solstice also comes the shortest day of the year.
Winter officially begins at 9:49pm today. The Winter Solstice occurs when the North Pole is tilted at its furthest from the sun – 23.5 degrees away. This results in the shortest day of the year in the Northern Hemisphere.
Here in Denver, with sunrise at 7:17am and sunset at 4:39pm, our day today is 9 hours, 21 minutes and 14 seconds long. Tomorrow it will be one second longer and each day from now through to the Summer Solstice in June will get gradually longer as well.
While we have a short day today, it is nothing like what will be experienced in the Arctic Circle. Areas north of there to the North Pole will have no direct sunlight at all. Conversely, areas south of the Antarctic Circle toward the South Pole will have 24 hours of daylight and have a midnight sun.
Did you know that there is a difference between the astronomical seasons that we are discussing here and meteorological seasons?
Meteorological seasons differ slightly and are geared toward matching the calendar with the annual temperature cycle. This is done primarily for meteorological observing and forecasting and in many ways it is more logical than the astronomical seasons.
For the Northern Hemisphere, the meteorological spring covers the months of March, April and May. Summer brings the hottest months of the year and so meteorological summer is June, July and August. Meteorological fall then is September, October and November followed by the coldest months of December, January and February as meteorological winter.
December 20 to December 26: This week in Denver weather history
The week leading up to Christmas is hectic enough but when you through in severe weather, it can be overwhelming. This week marks a number of notable weather events in Denver weather history but two stand out. Most recently was the storm three years ago that became the seventh biggest snowstorm in Denver weather history. Of course probably the most memorable for longtime Denver residents is the Christmas Eve storm of 1982 that buried the city for the holiday and for days afterwards.
From the National Weather Service:
17-24
In 1924…a prolonged cold spell occurred after mild temperatures during the first half of the month. Most low temperatures dipped below zero with the coldest reading of 15 degrees below zero occurring on the 24th. The high temperature of only 5 degrees on the 18th was a record low maximum for the date.
18-21
In 2010…a winter storm produced a 4-day period of moderate to heavy snow in the mountains. The combination of strong wind and heavy snow forced the closure of several mountain passes due to the threat of avalanches. The Amtrak train route… Which runs from Denver to California…was rerouted through Wyoming when Union Pacific closed its tracks along Interstate 70. Numerous accidents forced the closure of I-70 at times. The wind gusted to 60 mph over the higher mountain passes. Storm totals in the ski areas west of Denver ranged from 16 to 32 inches.
18-24
In 1998…a vigorous cold front with north winds gusting as high as 38 mph at Denver International Airport on the 18th dropped temperatures from a high of 51 degrees to a low of just 6 degrees before midnight. The arctic air mass that settled over metro Denver produced intermittent light snow and a week-long protracted cold spell that caused low temperatures to plunge well below zero for 6 consecutive nights. The coldest temperature was 19 degrees below zero on the morning of the 22nd. High temperatures climbed only into the single digits on 4 consecutive days…from the 19th through the 22nd. At least 15 people…mostly homeless… Were treated for hypothermia at area hospitals. The bitter cold weather was responsible…either directly or indirectly… For at least 5 fatalities. Three of the victims died directly from exposure. The cold weather also caused intermittent power outages. Following the cold snap… Thawing water pipes cracked and burst in several homes and businesses…causing extensive damage. Only one temperature record was set. The high temperature of only 7 degrees on the 19th set a record low maximum for the date.
19-20
In 1982…high winds buffeted the eastern foothills. At midday on the 19th…gusts of 75 to 80 mph were recorded in the Table Mesa area of Boulder. A gust to 62 mph was clocked in Boulder on the evening of the 20th.
In 1989…strong winds howled at mountain top level in clear creek and Gilpin counties. Speeds reached 97 mph on the summit of Squaw Mountain and 84 mph one mile south of Rollinsville. Northwest winds gusted 35 mph at Stapleton International Airport on the 20th.
19-23
In 1990…a surge of very cold arctic air invaded metro Denver. Many temperature records were broken as the mercury remained at or below zero for 85.5 hours at Stapleton International Airport…making it the third longest period of subzero readings in 118 years of record keeping. On the morning of the 22nd…the mercury plunged to 25 degrees below zero…which equaled the all time record low temperature for the month set on December 24…1876. In the foothills southwest of Denver at tiny town…the mercury plunged to 33 degrees below zero on the morning of the 21st. On the same morning at Castle Rock the temperature dipped to 26 degrees below zero. During the period…other daily temperature records were set at Denver…including: record low maximum of 3 degrees below zero on the 20th and a record low of 17 degrees below zero on the 23rd. The record low was equaled with 16 degrees below zero on the 20th and 21 degrees below zero on the 21st. Snowfall totaled 2.7 inches at Stapleton International Airport from the 19th through the 21st.
20
In 1894…southwest winds were sustained to 40 mph with gusts to 48 mph. The Chinook winds warmed the temperature to a maximum of 69 degrees…which was a record high temperature for the date. The minimum temperature dipped to only 33 degrees.
In 1903…northwest Chinook winds sustained to 54 mph with gusts to 60 mph warmed the temperature to a high of 58 degrees.
In 1948…strong winds occurred along the eastern foothills from Boulder north. Wind gusts to 45 mph were recorded at Valmont with a gust to 30 mph at Boulder airport. Some damage occurred. Wind gusts to 50 mph caused some blowing dust at Stapleton Airport.
In 1957…strong Chinook winds…gusting to 51 mph from the northwest…warmed the afternoon temperature to a high of 54 degrees.
In 1981 high winds were reported in the foothills with a peak gust of 87 mph recorded at Wondervu.
In 1992…strong Chinook winds raked the eastern foothills with 69 mph recorded at Table Mesa in south Boulder. Southwest winds gusted to only 21 mph at Stapleton International Airport.
In 1996…five construction workers were injured…two seriously…when a sudden wind gust blew over a 30-foot- high retaining wall they were working on in western Lakewood. The scaffolding they were standing on collapsed…and some were pinned under the rubble for 15 minutes. Wind gusts of 60 to 75 mph were reported in the area. Southwest winds gusted to only 24 mph at Denver International Airport.
In 2004…strong downslope winds developed over the eastern mountain slopes and spread over metro Denver. Peak wind gusts approached 100 mph along the foothills of Boulder County. In superior…a 1200-square-foot section of roof was peeled off the gymnasium at monarch high school. Two semi-trailers were toppled on Colorado Highway 58 at McIntyre Street and another at c-470 and West Bowles Avenue. Two airplanes were damaged by wind-blown debris at Jefferson County airport. The high winds forced the closure of State Highway 93 between Golden and Boulder for approximately two hours. Insurance agents estimated 650 to 850 homes suffered wind damage in the Boulder and Louisville areas. In addition…downed trees and power lines left about 1000 residents…mainly in the Boulder area…without electricity. At least three people suffered minor injuries in the storm. Peak wind reports included: 95 mph in superior…92 mph at Jefferson County airport…85 mph in Golden…81 mph in Boulder…80 mph in Broomfield and Evergreen…and 79 mph in Louisville. West northwest winds gusted to 59 mph at Denver International Airport.
20-21
In 1969…high winds caused widespread…but mostly minor damage to roofs…windows…and power lines and overturned some house trailers in areas along and just east of the foothills. Wind gusts of 60 to 70 mph were reported in Boulder and south of Boulder at Rocky Flats. A wind gust to 115 mph was measured in Boulder at the National Center for Atmospheric Research. At Stapleton International Airport…west winds gusted to 44 mph on the 20th and to 45 mph on the 21st. The warm Chinook winds warmed the high temperature to 56 degrees on the 20th and to 65 degrees on the 21st.
In 2006…a major blizzard buried greater metro Denver and the adjacent foothills in deep snow. A slow moving upper level low pressure center produced deep moist upslope flow over the high plains and against the eastern slopes of the mountains…allowing heavy snowfall to persist for 34 hours across metro Denver. Total snow accumulations ranged from 1 to 2 1/2 feet across the city and from 2 to nearly 4 feet in the foothills. Adding to the misery… Strong north winds sustained at 20 to 35 mph with gusts from 45 to nearly 60 mph produced much blowing snow and piled the snow into drifts from 6 to 12 feet high…closing businesses and bringing all transportation to a halt. The storm forced the closure of Denver International Airport for a total of 45 hours which snarled the nation’s air traffic system. This was the longest closure in the airport’s 12 year history. The closure stranded nearly 5000 travelers when 2000 flights were canceled. Many inbound flights were diverted to other airports…stranding even more passengers. Many of the stranded travelers failed to reach their final destinations until days after the airport re-opened due to fully booked flights during the holiday season. Police and national guardsmen rescued hundreds of commuters stuck in their cars…and sent them to temporary shelters set up by the Red Cross. All interstates and other major highways in and out of Denver were closed. Greyhound was forced to cancel all bus trips from Denver. Mail delivery was suspended. The Regional Transportation District suspended all metro Denver bus service for the first time since the March 2003 blizzard. The roof of a discount store in Aurora collapsed under the weight of the heavy snow. In Lakewood…a power outage left 5600 residents without electricity for a brief time. Metro Denver snowfall amounts included: 34 inches 10 miles southeast of Buckley AFB…32 inches in Littleton…30 inches in Thornton and near Castle Rock…29.5 inches near Parker…28 inches in Wheat Ridge…25.5 inches at Centennial Airport…25 inches at Niwot…24 inches in Aurora…22.5 inches at Greenwood Village… 22 inches in Arvada…21.5 inches in Lakewood…20 inches in Longmont…and 15.5 inches in Boulder. Snowfall measured 20.7 inches officially in the Denver Stapleton area. This ranked the snowfall as the 7th greatest in the city since 1946. North winds were sustained to 37 mph with gusts to 55 mph at Denver International Airport. In the foothills snowfall totaled: 42 inches at Conifer and 11 miles southwest of Boulder…40 inches at Evergreen…39 inches at Aspen Springs… 37.5 inches 8 miles north of Blackhawk…33 inches near Nederland…31 inches at Intercanyon and near Tiny Town…30.5 inches atop Buckhorn Mountain…30 inches near Indian Hills… 29 inches at Rollinsville…24 inches near Gross Reservoir and Ralston Reservoir…22.4 inches atop Crow Hill…and 20 inches near Georgetown. Snowpacked and rutted streets and parking lots persisted for a month or more after the storm and subsequent storms. The heavy snowfall created a snow removal controversy when many citizens complained that residential streets were not cleared in a timely manner in the city and in some suburban areas. This was in spite of the fact that tens of millions of dollars were spent on snow removal. In the city of Denver…snow cover of an inch or more from this storm and subsequent storms persisted for 61 consecutive days…through February 19…2007. This is the second longest period of snow cover on record in the city. Many homeowners who had extensive Christmas lights and decorations in their yards were not able to remove the lights because the wires were buried in deep snow and ice until the end of February or later.
Continue reading December 20 to December 26: This week in Denver weather history
NOAA details the chances for a white Christmas for the United States
With our most recent snowstorm, the Colorado Front Range is likely to enjoy a white Christmas (defined as 1 inch of snow on the ground on Christmas Day). Other locations in the United States of course are not quite so lucky and historically, Colorado can be quite hit or miss.
Below is the latest narrative from NOAA. To the right is a probability map – click it to view full size.
Minnesota. Maine. Upstate New York. The Allegheny Mountains of Pennsylvania and West Virginia. Practically anywhere in Idaho. And of course, the Rockies or the Sierra Nevada Mountains. These are the places where weather history suggests you want to be if you’re looking for the best chance of a white Christmas.
The map at right shows the historic probability of there being at least 1-inch of snow on the ground in the Lower 48 states on December 25 based on the latest (1981-2010) U.S. Climate Normals from NOAA’s National Climatic Data Center. Dark gray shows places where the probability is less than 10 percent, while white shows probabilities greater than 90 percent.
The 1981–2010 Climate Normals are the latest three-decade averages of several climatological measurements. This dataset contains daily and monthly Normals of temperature, precipitation, snowfall, heating and cooling degree days, frost/freeze dates, and growing degree days calculated from observations at approximately 9,800 stations operated by NOAA’s National Weather Service.
While the map shows the climatological probability that a snow depth of at least one inch will be observed on December 25, the actual conditions this year may vary widely from these probabilities because the weather patterns present will determine the snow on the ground or snowfall on Christmas day. These probabilities are useful as a guide only to show where snow on the ground is more likely. For prediction of your actual weather on Christmas Day, check out your local forecast at Weather.gov.
You can locate Normals data for the observing station closest to you using the NCDC’sinteractive map.
If you would like to keep track of the snowfall across the United States on a daily basis, see the National Operational Hydrologic Remote Sensing Center’s National Snow Analyses. For a more detailed assessment of the probability of a white Christmas as well as documentation of the methodology used to calculate the map’s underlying climatological statistics, see the scientific paper, White Christmas? An Application of NOAA’s 1981-2010 Daily Normals, by NCEI scientists and published in the Bulletin of the American Meteorological Society. You can also download a spreadsheet to see the full list of stations and their historic probabilities.
This post was adapted from an article first published by the National Climatic Data Center. It was first published on December 11, 2013, and is reviewed each year and updated as needed.