Average temperature in January is -4.3 °C
Average daytime temperature is 0 °C
Average night temperature is -7.9 °C
Absolute maximum temperature: 10.2 °C
Absolute minimum temperature: -22.1 °C
Number of sunny days: 18
Number of rainy days: 6
Number of snow days: 7
Precipitation sum: 52 mm
* Weather data for Fullerton United States is based on climate observations for 2023 year
| Gennaio (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 6.3 | 2.5 | -0.2 | -2.5 | -1.3 | 2.4 | -1.3 | 2.6 | 8 | 10.2 | 5.8 | -1.4 | 1.5 | 6.9 | 7.4 | 4.2 | 4.5 | 0.7 | -3.4 | -4.2 | -2.4 | -3.4 | 1.6 | -0.6 | -3.4 | -3 | 2.9 | -1.7 | -14.5 | -13.4 | -9.6 |
| Apparent max temperature | 2.9 | -1.2 | -4.5 | -8.7 | -5.6 | -1.8 | -4.6 | -0.9 | 3.3 | 6.3 | 1.6 | -6.6 | -3.2 | 1.9 | 3.4 | -1.6 | 0.8 | -3.1 | -8.1 | -8.1 | -6.5 | -7.3 | -1.9 | -3.8 | -9.6 | -7.6 | -1.5 | -6.3 | -21 | -17.8 | -14.9 |
| Mean temperature | 1.8 | 0.6 | -2.1 | -3.1 | -3.5 | -5.4 | -4.6 | -4.7 | 1.1 | 1 | 2 | -2.7 | -3.5 | 0.5 | 0.8 | 1.2 | 1.3 | -2.5 | -4.3 | -10.3 | -7.3 | -7.2 | -5.8 | -5.5 | -5.9 | -8.2 | 0.6 | -6.2 | -17 | -17.8 | -16.5 |
| Apparent mean temperature | -4.7 | -5.6 | -11.4 | -10.3 | -11.3 | -15.8 | -11.7 | -16.1 | -7.4 | -7.7 | -6 | -10 | -9.6 | -7.5 | -7.1 | -5.3 | -5.5 | -10.7 | -12.4 | -20.1 | -15.3 | -16.4 | -18.9 | -14.3 | -14.7 | -17.4 | -9.9 | -20.9 | -25.9 | -27.7 | -27.2 |
| Minimum temperature | -1.3 | -0.6 | -4.7 | -4.2 | -5.5 | -10.7 | -7.2 | -10.8 | -2.6 | -3.8 | -0.5 | -3.9 | -5.9 | -2.6 | -3.3 | -1.8 | -2 | -4.2 | -6 | -15.4 | -10.6 | -11.7 | -13.9 | -9.9 | -8 | -12.4 | -3.8 | -13.5 | -19.8 | -22.1 | -21.6 |
| Apparent min temperature | -1.6 | -4.2 | -8.1 | -9.2 | -8.9 | -9.8 | -8.8 | -9 | -3.2 | -3 | -2.8 | -8.8 | -7.9 | -4.4 | -3.2 | -3.5 | -2.7 | -7.6 | -10.5 | -14.9 | -11.5 | -11.8 | -10.3 | -9.7 | -11.9 | -12.9 | -4.8 | -12.1 | -23.5 | -22.8 | -22 |
| Gennaio | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 9.2 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.5 | 9.6 | 9.6 | 9.6 | 9.7 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.8 | 9.9 | 9.9 | 10 | 10 | 10 |
| Sunshine duration (h) | 1.2 | 0 | 0 | 0 | 8.3 | 8.1 | 5.1 | 8.3 | 7.8 | 8.2 | 4.4 | 6.6 | 5.3 | 6 | 5.6 | 8.2 | 5.8 | 0 | 8.1 | 8.6 | 4.3 | 1.4 | 4.4 | 6 | 5.5 | 7.4 | 8 | 0 | 2.5 | 8.8 | 8.8 |
| Precipitation (mm) | 0 | 6.1 | 13.8 | 0.3 | 0 | 0.3 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0.1 | 0 | 24.9 | 3.4 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0.6 | 1.6 | 0.1 | 0.2 | 0 |
| Precipitation hours | 0 | 7 | 22 | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 13 | 13 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 3 | 11 | 1 | 2 | 0 |
| Wind speed (m/s) | 12.5 | 25.2 | 31.5 | 28.8 | 21.1 | 12.2 | 12.9 | 13.3 | 17.7 | 14.1 | 26.3 | 29.3 | 15.8 | 19.4 | 15 | 25.4 | 15.7 | 26.3 | 32.2 | 11.2 | 11.4 | 14.1 | 16 | 14.3 | 29.7 | 18.5 | 31.1 | 28.9 | 26.6 | 13.3 | 13.7 |
In January 2023, the highest daytime temperature in Fullerton was 10.2°C.
While the minimum temperature at night dropped to -22.1°C.
The average nighttime and daytime temperatures during January in Fullerton are -7.9°C and 0°C respectively.
The precipitation sum in January is about 52 mm.