Average annual temperature is 11.0 °C
Absolute maximum temperature: 34.4 °C
Absolute minimum temperature: -17.2 °C
Number of sunny days: 248 days
Number of rainy days: 103 days
Number of snow days: 14 days
Look at detailed online map of Fullerton (historical)
* Weather data for Fullerton (historical) 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) | 12.1 | 13.8 | 17.7 | 27.0 | 27.5 | 32.6 | 34.4 | 34.3 | 31.3 | 26.5 | 21.0 | 13.0 |
| Average daytime temperature (°C) | 5.2 | 7.8 | 11.4 | 19.6 | 23.0 | 27.7 | 32.5 | 28.5 | 26.3 | 21.3 | 13.7 | 8.2 |
| Average temperature (°C) | -1.4 | 0.1 | 4.2 | 10.7 | 15.2 | 19.7 | 24.5 | 21.1 | 18.0 | 12.7 | 5.6 | 0.5 |
| Average night temperature (°C) | -6.0 | -4.9 | -1.8 | 2.1 | 7.0 | 10.8 | 15.8 | 14.0 | 10.2 | 5.2 | -0.3 | -4.5 |
| Absolute minimum temperature (°C) | -17.2 | -12.9 | -11.1 | -8.0 | 2.1 | 6.2 | 13.8 | 10.4 | 6.0 | -4.3 | -7.7 | -9.6 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 8.3 | 9.1 | 9.8 | 11.9 | 12.4 | 13.1 | 12.8 | 11.8 | 10.9 | 10.1 | 8.8 | 8.0 |
| Precipitation (mm) | 32 | 16 | 26 | 3 | 20 | 5 | 20 | 38 | 13 | 3 | 29 | 31 |
| Sunny days | 22 | 21 | 19 | 23 | 20 | 23 | 21 | 11 | 19 | 25 | 22 | 22 |
| Rainy days | 5 | 3 | 9 | 7 | 11 | 7 | 10 | 20 | 11 | 6 | 8 | 6 |
| Snow days | 4 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The largest precipitation sum in Fullerton (historical) is at