For the third month in a row, September brought above average temperatures and above average precipitation to Thornton. The month was, however, lacking of much drama making for a pretty quiet month.
Thornton’s average temperature for the month came in at 66.2 degrees. That was a good bit above our running 17-year average of 64.0 degrees. Temperatures ranged from a high of 100 degrees on the first down to 43 degrees on the 16th and 25th.
Denver, as measured at Denver International Airport, saw even warmer temperatures. The Mile High City’s average temperature was 68.0 degrees, 3.2 degrees above their September average. It tied Denver’s record for the 8th warmest September on record (since 1872).
In terms of precipitation, Thornton’s September came in at a healthy 2.47 inches. That was nearly an inch above our 17-year running average for the month of 1.49 inches. Much of that, however, came in a single afternoon deluge on the 14th that dumped 1.90 inches of rain.
Denver saw considerably less precipitation (as measured at DIA) with a mere 0.67 inches falling in their bucket. That was well below the Mile High City’s September average of 1.35 inches.
No snowfall was recorded in Thornton or Denver for the month.
Click here to view Thornton’s complete September 2023 climate summary report.
