Average annual temperature is 14.5 °C
Absolute maximum temperature: 41.2 °C
Absolute minimum temperature: -2.9 °C
Number of sunny days: 258 days
Number of rainy days: 107 days
Look at detailed online map of Lake Berryessa
* Weather data for Lake Berryessa 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) | 18.5 | 21.0 | 17.3 | 32.0 | 32.7 | 38.4 | 41.2 | 40.8 | 35.6 | 33.7 | 25.6 | 19.5 |
| Average daytime temperature (°C) | 12.9 | 13.6 | 12.8 | 21.2 | 24.3 | 28.3 | 35.6 | 34.5 | 28.8 | 25.7 | 18.2 | 14.8 |
| Average temperature (°C) | 7.8 | 6.5 | 7.0 | 12.7 | 15.9 | 18.8 | 24.5 | 24.1 | 19.5 | 16.7 | 11.1 | 8.8 |
| Average night temperature (°C) | 4.4 | 1.6 | 3.0 | 6.1 | 9.3 | 11.3 | 15.0 | 15.7 | 12.8 | 9.9 | 5.6 | 4.4 |
| Absolute minimum temperature (°C) | -1.9 | -2.9 | -2.3 | 0.3 | 4.7 | 9.2 | 9.4 | 12.0 | 9.4 | 2.8 | -1.2 | -0.9 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.6 | 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) | 5.3 | 7.6 | 7.4 | 11.3 | 11.9 | 13.4 | 13.5 | 12.3 | 11.2 | 9.2 | 7.7 | 5.5 |
| Precipitation (mm) | 271 | 94 | 249 | 6 | 25 | 0 | 0 | 1 | 6 | 14 | 47 | 127 |
| Sunny days | 12 | 16 | 8 | 27 | 22 | 29 | 30 | 29 | 24 | 25 | 21 | 15 |
| Rainy days | 19 | 12 | 23 | 3 | 9 | 1 | 1 | 2 | 6 | 6 | 9 | 16 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Lake Berryessa during the most sunny months:
The largest precipitation sum in Lake Berryessa is at