Average annual temperature is 5.1 °C
Absolute maximum temperature: 34.1 °C
Absolute minimum temperature: -30.9 °C
Number of sunny days: 170 days
Number of rainy days: 127 days
Number of snow days: 68 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) | 4.3 | 5.6 | 5.5 | 18.7 | 24.8 | 26.2 | 32.7 | 34.1 | 27.3 | 22.6 | 11.5 | 10.2 |
| Average daytime temperature (°C) | -1.0 | 0.3 | 0.2 | 7.1 | 18.0 | 19.5 | 27.0 | 26.3 | 20.7 | 12.3 | 6.9 | 3.6 |
| Average temperature (°C) | -6.3 | -5.9 | -5.0 | 1.0 | 11.0 | 13.1 | 18.4 | 17.9 | 12.6 | 4.8 | 0.7 | -2.0 |
| Average night temperature (°C) | -10.6 | -10.6 | -9.2 | -3.9 | 4.1 | 6.7 | 9.5 | 10.5 | 5.8 | -0.5 | -3.8 | -6.4 |
| Absolute minimum temperature (°C) | -28.4 | -30.9 | -17.2 | -12.4 | -2.4 | 0.0 | 4.9 | 7.2 | -0.1 | -23.7 | -11.7 | -15.2 |
| 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 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.3 | 11.9 | 13.6 | 15.0 | 15.7 | 15.4 | 14.1 | 12.6 | 10.9 | 9.5 | 8.7 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 5.6 | 6.9 | 7.4 | 9.9 | 11.3 | 11.1 | 13.6 | 11.1 | 10.1 | 7.6 | 6.7 | 5.9 |
| Precipitation (mm) | 19 | 21 | 42 | 51 | 68 | 100 | 16 | 64 | 49 | 40 | 10 | 11 |
| Sunny days | 16 | 13 | 10 | 15 | 7 | 2 | 15 | 14 | 18 | 18 | 21 | 21 |
| Rainy days | 2 | 0 | 1 | 7 | 24 | 28 | 16 | 17 | 12 | 9 | 8 | 3 |
| Snow days | 13 | 15 | 20 | 8 | 0 | 0 | 0 | 0 | 0 | 4 | 1 | 7 |
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