Average annual temperature is 11.6 °C
Absolute maximum temperature: 38.8 °C
Absolute minimum temperature: -22.1 °C
Number of sunny days: 224 days
Number of rainy days: 119 days
Number of snow days: 22 days
Look at detailed online map of Fullerton
* Weather data for Fullerton 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) | 10.2 | 15.3 | 20.6 | 29.2 | 30.3 | 34.0 | 36.7 | 38.8 | 35.6 | 31.9 | 19.5 | 12.2 |
| Average daytime temperature (°C) | 0.0 | 5.3 | 8.8 | 18.3 | 25.4 | 29.4 | 29.4 | 30.8 | 28.1 | 18.1 | 11.8 | 5.9 |
| Average temperature (°C) | -4.3 | -1.7 | 1.5 | 10.9 | 18.9 | 23.4 | 23.7 | 24.6 | 21.6 | 12.4 | 5.7 | 1.1 |
| Average night temperature (°C) | -7.9 | -6.3 | -3.6 | 4.8 | 13.0 | 17.5 | 18.6 | 19.5 | 16.1 | 7.8 | 1.0 | -2.5 |
| Absolute minimum temperature (°C) | -22.1 | -21.2 | -10.5 | -5.4 | 2.7 | 10.0 | 12.9 | 13.0 | 9.1 | -7.0 | -5.8 | -6.9 |
| 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 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| 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) | 5.2 | 7.8 | 8.5 | 10.6 | 11.2 | 12.3 | 12.0 | 11.6 | 10.3 | 7.5 | 7.1 | 4.8 |
| Precipitation (mm) | 51 | 29 | 41 | 13 | 33 | 65 | 70 | 18 | 39 | 108 | 27 | 40 |
| Sunny days | 18 | 18 | 22 | 22 | 15 | 13 | 13 | 22 | 21 | 16 | 24 | 20 |
| Rainy days | 6 | 7 | 6 | 6 | 16 | 17 | 18 | 9 | 9 | 15 | 3 | 7 |
| Snow days | 7 | 3 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 4 |
The best time to visit Fullerton during the most sunny months:
The largest precipitation sum in Fullerton is at