Average temperature in January is 4.8 °C
Average daytime temperature is 11.4 °C
Average night temperature is -0.4 °C
Absolute maximum temperature: 19.4 °C
Absolute minimum temperature: -7.9 °C
Number of sunny days: 26
Number of rainy days: 2
Number of snow days: 3
Precipitation sum: 6 mm
* Weather data for Santa Rosa United States is based on climate observations for 2023 year
| January (°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 | 16.5 | 13.2 | 7.7 | 9.5 | 14.4 | 14.3 | 11.6 | 17.1 | 17 | 17.6 | 15.2 | 12.1 | 18.3 | 19.4 | 15.5 | 10.9 | 10.5 | 9.3 | 10.8 | 10.8 | 8.1 | 9.1 | 7 | 6.2 | 2.4 | 4.7 | 9.8 | 11.7 | 12.8 | 6.4 | 3.7 |
| Apparent max temperature | 12.3 | 9 | -1.9 | 0.9 | 7.6 | 7 | 6.9 | 10.8 | 9.5 | 9.5 | 8.3 | 6.5 | 13.8 | 11.6 | 10.4 | 3.3 | 5.9 | 4.4 | 5.8 | 3.5 | 1.7 | 3.9 | 2.5 | -0.2 | -1.9 | -1.7 | 3.5 | 3.9 | 5.7 | 0.3 | -1.5 |
| Mean temperature | 10.4 | 8.2 | 4.2 | 4.1 | 5.2 | 8.8 | 5.7 | 5.8 | 8.9 | 10.7 | 9.6 | 4.2 | 7.3 | 9.6 | 11.2 | 7.3 | 6.6 | 4 | 3.4 | 2.6 | 2.2 | 1.1 | 1.7 | 1.7 | 0.1 | -1.5 | 1.2 | 4.5 | 2.2 | -1 | -2.2 |
| Apparent mean temperature | 1.6 | -1.7 | -5.4 | -6.2 | -4.9 | -1.2 | -6.1 | -7.8 | -1.6 | 0.2 | -0.6 | -7.6 | -4.2 | -2.8 | 2.5 | -2.8 | -1 | -8.5 | -7.8 | -6.6 | -8.1 | -9 | -6.5 | -5.2 | -6.6 | -10.4 | -9.6 | -7.2 | -10.3 | -12.8 | -12.9 |
| Minimum temperature | 5.1 | 3.9 | 1.3 | 0.9 | -0.4 | 2.3 | -2 | -2.2 | 3.7 | 5.7 | 4.2 | -3.6 | 0.5 | 2.5 | 6.9 | 3.9 | 2.3 | 0.1 | -2.2 | -1.7 | -2 | -4.8 | -1.4 | -1.9 | -2.5 | -6.4 | -3.3 | -0.4 | -5.4 | -7.9 | -7.5 |
| Apparent min temperature | 5.8 | 3.2 | -3.6 | -3.2 | -0.8 | 3.6 | 0.5 | 0.6 | 3 | 4.6 | 2.5 | -1.2 | 2.5 | 4 | 5 | -0.2 | 2.1 | -4 | -2.9 | -2 | -4.1 | -3.7 | -3.7 | -2.8 | -4.1 | -6 | -5.4 | -2.8 | -2.7 | -6.2 | -7.1 |
| January | 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) | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 10 | 10 | 10 | 10 | 10 | 10 | 10.1 | 10.1 | 10.1 | 10.1 | 10.1 | 10.2 | 10.2 | 10.2 | 10.2 | 10.3 | 10.3 | 10.3 | 10.3 | 10.4 | 10.4 | 10.4 | 10.5 |
| Sunshine duration (h) | 3.5 | 5.8 | 7.5 | 8.9 | 7.6 | 8.4 | 8.7 | 9 | 9 | 8.6 | 9.1 | 9.1 | 9.1 | 8.8 | 9.1 | 7.1 | 3.2 | 9.2 | 9.2 | 9.3 | 9.3 | 9.3 | 2.7 | 8.2 | 5.9 | 8.9 | 9.4 | 9.5 | 9.5 | 7.1 | 7.3 |
| Precipitation (mm) | 0 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0 | 2.2 | 2.3 | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation hours | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 5 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wind speed (m/s) | 26.3 | 42.8 | 48.4 | 40.4 | 29.3 | 41.9 | 29 | 24.1 | 30.6 | 38.3 | 53.7 | 42 | 13.8 | 32.6 | 48 | 44.3 | 41.1 | 54.4 | 35.4 | 27.1 | 35.1 | 20.6 | 23.3 | 28.7 | 18.5 | 27.2 | 34.3 | 33.9 | 26.4 | 26.9 | 20.4 |
In January 2023, the highest daytime temperature in Santa Rosa was 19.4°C.
While the minimum temperature at night dropped to -7.9°C.
The average nighttime and daytime temperatures during January in Santa Rosa are -0.4°C and 11.4°C respectively.
The precipitation sum in January is about 6 mm.