Thornton, CO Weather & Climate Normals
Thornton's real weather, in one number
Thornton, CO scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Thornton's hottest and coldest months
Thornton's hottest month is Jul, averaging 75°F; its coldest is Dec, averaging 33°F, a 41.7°F swing across the year, a middling gap by national standards.
Thornton's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 48°F | 19°F | 0.45in | 6in |
| Feb | 50°F | 20°F | 0.54in | 7.6in |
| Mar | 58°F | 28°F | 1.21in | 8.2in |
| Apr | 64°F | 35°F | 1.94in | 6.5in |
| May | 72°F | 44°F | 2.35in | 1.2in |
| Jun | 85°F | 53°F | 1.5in | 0in |
| Jul | 91°F | 59°F | 1.73in | 0in |
| Aug | 89°F | 57°F | 1.32in | 0in |
| Sep | 82°F | 49°F | 1.19in | 0.1in |
| Oct | 67°F | 37°F | 1.07in | 2.4in |
| Nov | 56°F | 27°F | 0.73in | 6.9in |
| Dec | 48°F | 19°F | 0.48in | 5.9in |
May, Jun, Jul, Aug, and Sep are the best time to see Thornton at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Thornton
Thornton averages 14.51in of precipitation a year across roughly 73 days with measurable rain or snow, and 44.8in of snow a year.
Where Thornton ranks
Thornton ranks 3648 of 4876 US cities in this dataset for comfort score, and 33 of 79 within CO. About 146,689 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Northglenn, CO US, 4.1 miles from Thornton, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station