Average temperature in January is -3.8 °C
Average daytime temperature is -0.6 °C
Average night temperature is -7.2 °C
Absolute maximum temperature: 8 °C
Absolute minimum temperature: -19.3 °C
Number of sunny days: 12
Number of rainy days: 14
Number of snow days: 5
Precipitation sum: 142 mm
* Weather data for Selfoss Iceland 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 | -5 | 2 | 0.3 | -6.7 | -6 | -4 | -1.1 | 2.7 | 1.6 | 0.4 | 0.7 | -1.6 | -6.1 | -7.8 | -11.5 | -8.4 | -5.1 | -11.1 | -3.1 | 7.3 | 7.5 | 2 | -1.9 | 6.1 | 2.9 | 8 | 4.3 | 7.5 | 2.5 | 1.4 | 2.3 |
| Apparent max temperature | -10.7 | -1.5 | -3.6 | -11.7 | -10.5 | -9 | -5.8 | -1.9 | -3.9 | -4.5 | -3.9 | -6.3 | -11.1 | -13.2 | -17 | -13.6 | -9.9 | -16.5 | -7.6 | 3.2 | 3.3 | -2.7 | -6.4 | 2.6 | -1.2 | 4 | -1.7 | 3.3 | -1.2 | -3.5 | -3.3 |
| Mean temperature | -11.1 | 0.6 | -5.8 | -10 | -10.4 | -7.4 | -2.2 | 0.8 | -0.3 | -0.7 | -2.6 | -4.2 | -8.1 | -10 | -13.5 | -13 | -7.1 | -13.1 | -9.6 | 4.6 | 2.6 | -0.5 | -6.9 | 1.8 | -0.5 | 6 | 1.9 | 3.7 | -0.9 | -1.3 | -1.2 |
| Apparent mean temperature | -24 | -5.5 | -16 | -20.8 | -19.2 | -15.3 | -9.7 | -6.1 | -7.4 | -7 | -9.8 | -12.5 | -14.5 | -18.6 | -21.8 | -21.4 | -16.4 | -20.8 | -18.5 | -6 | -4 | -10.6 | -17.8 | -5.7 | -6.9 | -2 | -5.5 | -3 | -7.4 | -9.3 | -11.1 |
| Minimum temperature | -19.3 | -2 | -11.5 | -15.2 | -14 | -10.3 | -3.7 | -1.6 | -2.6 | -2 | -4.6 | -7.8 | -9.3 | -12.9 | -16.4 | -15.9 | -11.5 | -15.1 | -13.3 | -1.4 | -0.4 | -3.4 | -12.9 | -1.6 | -3 | 3.3 | 1 | 0.2 | -3.6 | -4.1 | -6.8 |
| Apparent min temperature | -16 | -3.6 | -9.8 | -15 | -15.3 | -12.3 | -7.3 | -4 | -5.7 | -5.5 | -7.5 | -9.1 | -13.1 | -15.6 | -19.1 | -18.4 | -12.1 | -18.4 | -14.6 | 0.2 | -1 | -6.7 | -11.3 | -1.7 | -4.4 | 1.8 | -3.7 | -0.3 | -4.4 | -6.4 | -6.2 |
| 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) | 4.5 | 4.5 | 4.6 | 4.7 | 4.7 | 4.8 | 4.8 | 4.9 | 5 | 5.1 | 5.1 | 5.2 | 5.3 | 5.4 | 5.5 | 5.6 | 5.7 | 5.7 | 5.8 | 5.9 | 6 | 6.1 | 6.2 | 6.3 | 6.4 | 6.5 | 6.6 | 6.7 | 6.8 | 6.9 | 7 |
| Sunshine duration (h) | 1 | 0 | 2 | 3.4 | 0 | 1.2 | 0 | 0 | 1.5 | 1.1 | 1 | 1.3 | 1.6 | 2.2 | 2.5 | 2.6 | 2.8 | 2.9 | 2 | 0 | 0 | 2.8 | 0.1 | 0 | 1.8 | 0 | 2.6 | 0 | 2.5 | 0 | 0 |
| Precipitation (mm) | 6 | 8.3 | 0.2 | 0 | 0 | 0 | 3.7 | 0.8 | 0.4 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 34.8 | 6.2 | 2.4 | 1.7 | 10.3 | 0.5 | 23.9 | 0.7 | 20 | 3.6 | 15.1 | 3.7 |
| Precipitation hours | 12 | 15 | 2 | 0 | 0 | 0 | 10 | 4 | 3 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 22 | 15 | 8 | 4 | 18 | 4 | 24 | 3 | 16 | 10 | 11 | 12 |
| Wind speed (m/s) | 17.8 | 19 | 11.6 | 14.2 | 12.3 | 19.6 | 20.1 | 22.4 | 25.1 | 16.5 | 15.3 | 16.4 | 13.2 | 15.8 | 15.7 | 14.6 | 16.3 | 14.4 | 13.3 | 28.8 | 25.2 | 36.9 | 11.6 | 21.9 | 20.2 | 25.7 | 29.6 | 28.2 | 14.6 | 26.9 | 27.3 |
In January 2023, the highest daytime temperature in Selfoss was 8°C.
While the minimum temperature at night dropped to -19.3°C.
The average nighttime and daytime temperatures during January in Selfoss are -7.2°C and -0.6°C respectively.
The precipitation sum in January is about 142 mm.