Average annual temperature is 13.4 °C
Absolute maximum temperature: 40.9 °C
Absolute minimum temperature: -5.1 °C
Number of sunny days: 236 days
Number of rainy days: 128 days
Number of snow days: 1 day
Look at detailed online map of Grass Valley
* Weather data for Grass Valley 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) | 16.9 | 19.1 | 16.6 | 28.1 | 29.5 | 36.1 | 40.9 | 38.5 | 30.0 | 30.9 | 22.8 | 20.0 |
| Average daytime temperature (°C) | 10.2 | 10.7 | 9.1 | 17.8 | 21.7 | 26.8 | 34.5 | 32.2 | 25.4 | 22.6 | 16.4 | 13.4 |
| Average temperature (°C) | 5.2 | 4.6 | 4.3 | 10.9 | 15.1 | 19.3 | 26.1 | 24.2 | 18.0 | 14.9 | 9.5 | 7.6 |
| Average night temperature (°C) | 1.8 | 0.2 | 1.0 | 5.0 | 8.8 | 12.2 | 16.9 | 16.3 | 11.6 | 9.1 | 4.6 | 3.2 |
| Absolute minimum temperature (°C) | -3.8 | -3.6 | -4.3 | -5.1 | 3.3 | 7.2 | 10.1 | 12.0 | 7.9 | -0.8 | -0.2 | -2.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.4 | 11.2 | 10.1 | 9.5 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.0 | 6.9 | 6.7 | 11.2 | 11.8 | 13.0 | 13.6 | 12.1 | 10.8 | 9.4 | 8.0 | 5.7 |
| Precipitation (mm) | 396 | 173 | 373 | 29 | 51 | 3 | 0 | 16 | 77 | 35 | 92 | 156 |
| Sunny days | 11 | 14 | 7 | 25 | 19 | 22 | 30 | 28 | 23 | 22 | 21 | 14 |
| Rainy days | 20 | 13 | 24 | 5 | 12 | 8 | 1 | 3 | 7 | 9 | 9 | 17 |
| Snow days | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Grass Valley during the most sunny months:
The largest precipitation sum in Grass Valley is at