Average temperature in December is -1.9 °C
Average daytime temperature is -0.3 °C
Average night temperature is -4 °C
Absolute maximum temperature: 6.4 °C
Absolute minimum temperature: -8.3 °C
Number of sunny days: 4
Number of rainy days: 14
Number of snow days: 13
Precipitation sum: 50 mm
* Weather data for Jomala Åland is based on climate observations for 2023 year
| December (°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 | -2.4 | -3.4 | -2.2 | -2.2 | -4.4 | -4 | 0.8 | 0.1 | -1.2 | 0.2 | -0.2 | -4.2 | -3 | -1.5 | -1.6 | 6.4 | 4.7 | 3.5 | 5.6 | 0.6 | 1.5 | 0.8 | 0.6 | -1.2 | -0.5 | -2.2 | 0.8 | 2.1 | 1.2 | 0.2 | -4.5 |
| Apparent max temperature | -7.6 | -6.3 | -7.2 | -6.6 | -8 | -7.9 | -4.4 | -6 | -6.4 | -3.9 | -5.4 | -9 | -7.7 | -5.8 | -5.1 | -0.1 | -1.3 | -1.3 | -0.2 | -3.7 | -2.2 | -3.4 | -3.2 | -5.9 | -4.7 | -5.3 | -5.2 | -1.4 | -1.8 | -3.2 | -9 |
| Mean temperature | -3.3 | -4.1 | -4.6 | -4.5 | -5.5 | -5.8 | -0.4 | -0.8 | -2.1 | -1.2 | -1.3 | -4.6 | -3.9 | -2.4 | -3.4 | 1.4 | 2.3 | 1.8 | 2.8 | -0.7 | 0.6 | 0.4 | 0.1 | -4 | -1.9 | -4.1 | -1.2 | -1.1 | 0.5 | -1.9 | -6.7 |
| Apparent mean temperature | -8.8 | -9.9 | -10.5 | -10.3 | -10.3 | -12.1 | -7.7 | -6.9 | -7.9 | -7.1 | -9.2 | -9.7 | -9.8 | -7.7 | -12.6 | -6.8 | -2.9 | -3.4 | -5.9 | -7.2 | -5.8 | -6.5 | -6.8 | -12.2 | -8.5 | -11.1 | -10 | -12.7 | -3.6 | -9.7 | -12.9 |
| Minimum temperature | -4.5 | -5.3 | -5.7 | -6.3 | -5.9 | -7.6 | -3.4 | -1.4 | -2.8 | -2.5 | -4 | -5.1 | -5 | -3.2 | -8.3 | -2.5 | 1.4 | 0.8 | -0.1 | -2.4 | -0.7 | -0.3 | -1 | -7.8 | -4.7 | -6.8 | -4.8 | -7.8 | 0 | -4.9 | -7.9 |
| Apparent min temperature | -8.1 | -7.9 | -8.9 | -8.6 | -9.5 | -9.6 | -5.5 | -6.4 | -7.2 | -5.6 | -6.4 | -9.4 | -8.7 | -6.7 | -7.4 | -3.5 | -2.3 | -2.4 | -3 | -5.2 | -4.1 | -5.2 | -4.2 | -8.6 | -5.7 | -8.3 | -6.8 | -5.8 | -2.9 | -6 | -11.4 |
| December | 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) | 6.4 | 6.4 | 6.3 | 6.3 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6 | 6 | 6 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 6 |
| Sunshine duration (h) | 0 | 0 | 0 | 1.9 | 0 | 2.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.3 | 0 | 3.2 | 3 | 3 | 2 | 0 | 1.2 | 0 | 0 | 3.3 | 0 | 0 | 0 | 0 | 0 |
| Precipitation (mm) | 0 | 0.4 | 1.1 | 1.8 | 0.3 | 0.1 | 1.8 | 3.6 | 1.2 | 1.1 | 1.2 | 0.5 | 0.2 | 0.2 | 0.1 | 0 | 0.1 | 0 | 6.1 | 5 | 2 | 11.9 | 0.5 | 0.2 | 1.4 | 0.9 | 1 | 2.7 | 3.8 | 0.8 | 0 |
| Precipitation hours | 0 | 4 | 8 | 6 | 3 | 1 | 10 | 13 | 12 | 9 | 12 | 5 | 2 | 2 | 1 | 0 | 1 | 0 | 4 | 9 | 7 | 22 | 4 | 2 | 10 | 4 | 8 | 12 | 6 | 7 | 0 |
| Wind speed (m/s) | 18 | 11.1 | 14.8 | 22 | 10.1 | 10.4 | 26.4 | 24.9 | 18.9 | 18.1 | 20.5 | 15.8 | 15.3 | 12.7 | 15.6 | 34.3 | 27 | 21.5 | 30.7 | 22.6 | 30.6 | 32.4 | 23.1 | 21.9 | 11.9 | 13.5 | 28.6 | 26.8 | 13.9 | 12.9 | 14 |
In December 2023, the highest daytime temperature in Jomala was 6.4°C.
While the minimum temperature at night dropped to -8.3°C.
The average nighttime and daytime temperatures during December in Jomala are -4°C and -0.3°C respectively.
The precipitation sum in December is about 50 mm.