Average annual temperature is -0.9 °C
Absolute maximum temperature: 25.2 °C
Absolute minimum temperature: -29.6 °C
Number of sunny days: 138 days
Number of rainy days: 121 days
Number of snow days: 106 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) | -1.8 | 1.0 | -2.7 | 11.5 | 14.2 | 18.4 | 25.2 | 24.9 | 16.1 | 14.8 | 3.6 | 4.1 |
| Average daytime temperature (°C) | -7.3 | -5.6 | -6.6 | 0.2 | 8.0 | 10.9 | 20.2 | 18.0 | 12.2 | 6.6 | -0.7 | -2.1 |
| Average temperature (°C) | -11.6 | -10.8 | -11.0 | -5.1 | 2.6 | 4.6 | 13.7 | 11.6 | 6.7 | 0.8 | -5.8 | -7.7 |
| Average night temperature (°C) | -14.8 | -14.6 | -14.7 | -9.4 | -2.5 | -1.7 | 6.3 | 5.4 | 1.5 | -3.8 | -10.8 | -12.8 |
| Absolute minimum temperature (°C) | -27.2 | -20.6 | -21.1 | -17.6 | -10.7 | -7.4 | -1.4 | -0.7 | -5.5 | -21.4 | -27.3 | -29.6 |
| 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) | 9.3 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.1 | 14.0 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 6.1 | 7.3 | 6.2 | 10.1 | 11.9 | 12.5 | 13.4 | 11.5 | 10.6 | 8.6 | 6.6 | 5.7 |
| Precipitation (mm) | 56 | 54 | 173 | 54 | 74 | 100 | 19 | 93 | 31 | 42 | 39 | 58 |
| Sunny days | 15 | 8 | 6 | 10 | 5 | 0 | 19 | 11 | 13 | 18 | 16 | 17 |
| Rainy days | 2 | 1 | 4 | 1 | 23 | 27 | 12 | 20 | 15 | 7 | 5 | 4 |
| Snow days | 14 | 19 | 21 | 19 | 3 | 3 | 0 | 0 | 2 | 6 | 9 | 10 |
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