Average annual temperature is 2.7 °C
Absolute maximum temperature: 30.8 °C
Absolute minimum temperature: -26.9 °C
Number of sunny days: 186 days
Number of rainy days: 115 days
Number of snow days: 64 days
Look at detailed online map of Boulder
* Weather data for Boulder United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | -1.4 | -0.2 | 2.7 | 11.7 | 21.3 | 22.5 | 30.8 | 29.0 | 25.3 | 18.6 | 9.1 | 3.7 |
| Average daytime temperature (°C) | -6.5 | -5.7 | -3.7 | 2.8 | 15.3 | 18.6 | 26.7 | 24.0 | 19.5 | 12.1 | 4.2 | -2.1 |
| Average temperature (°C) | -10.4 | -10.4 | -8.8 | -2.6 | 8.0 | 11.7 | 18.5 | 16.5 | 12.0 | 5.1 | -1.8 | -6.8 |
| Average night temperature (°C) | -13.9 | -14.6 | -13.2 | -7.4 | 0.7 | 4.8 | 10.3 | 9.9 | 5.9 | 0.0 | -5.7 | -11.3 |
| Absolute minimum temperature (°C) | -26.9 | -25.0 | -19.9 | -14.0 | -4.4 | 1.4 | 5.8 | 4.8 | 0.7 | -9.1 | -17.0 | -24.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.4 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.8 | 7.8 | 8.3 | 10.2 | 12.6 | 11.8 | 13.3 | 11.7 | 10.4 | 8.6 | 7.2 | 6.4 |
| Precipitation (mm) | 47 | 33 | 36 | 30 | 36 | 73 | 10 | 47 | 37 | 30 | 21 | 22 |
| Sunny days | 18 | 14 | 13 | 17 | 7 | 5 | 18 | 15 | 15 | 21 | 23 | 20 |
| Rainy days | 1 | 2 | 1 | 4 | 24 | 25 | 13 | 16 | 15 | 10 | 4 | 0 |
| Snow days | 12 | 12 | 17 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 11 |
The best time to visit Boulder during the most sunny months:
Months with the longest average daylight duration in Boulder:
The largest precipitation sum in Boulder is at