Average annual temperature is 8.5 °C
Absolute maximum temperature: 37.1 °C
Absolute minimum temperature: -15.7 °C
Number of sunny days: 209 days
Number of rainy days: 105 days
Number of snow days: 51 days
Look at detailed online map of Lassen County
* Weather data for Lassen County 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) | 3.8 | 6.0 | 5.0 | 20.8 | 26.1 | 30.1 | 37.1 | 32.9 | 27.0 | 24.1 | 17.7 | 9.1 |
| Average daytime temperature (°C) | -0.4 | 0.7 | 1.1 | 8.8 | 17.4 | 21.5 | 31.4 | 27.9 | 21.9 | 16.5 | 8.9 | 5.5 |
| Average temperature (°C) | -3.5 | -3.3 | -2.4 | 3.8 | 11.8 | 15.4 | 24.2 | 21.7 | 15.9 | 10.7 | 4.6 | 1.9 |
| Average night temperature (°C) | -6.1 | -7.0 | -5.2 | -0.2 | 6.9 | 10.2 | 17.3 | 16.2 | 11.1 | 6.4 | 1.4 | -0.7 |
| Absolute minimum temperature (°C) | -15.7 | -12.2 | -11.5 | -8.6 | -1.2 | 2.0 | 12.4 | 9.9 | 4.0 | -2.5 | -5.8 | -4.9 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 5.5 | 8.2 | 8.0 | 11.1 | 12.0 | 12.8 | 13.7 | 12.1 | 10.5 | 9.3 | 7.9 | 6.1 |
| Precipitation (mm) | 140 | 58 | 124 | 11 | 63 | 66 | 3 | 15 | 49 | 6 | 29 | 26 |
| Sunny days | 12 | 15 | 6 | 20 | 9 | 10 | 29 | 24 | 23 | 24 | 20 | 17 |
| Rainy days | 3 | 1 | 10 | 5 | 21 | 20 | 2 | 7 | 7 | 7 | 10 | 12 |
| Snow days | 16 | 12 | 15 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The best time to visit Lassen County during the most sunny months:
The largest precipitation sum in Lassen County is at