Average temperature in December is 0.6 °C
Average daytime temperature is 2.4 °C
Average night temperature is -1.3 °C
Absolute maximum temperature: 7.7 °C
Absolute minimum temperature: -8.4 °C
Number of sunny days: 7
Number of rainy days: 19
Number of snow days: 5
Precipitation sum: 68 mm
* Weather data for Olsztyn Poland 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 | -1.7 | -0.4 | -1 | -2.2 | -4.7 | -2.1 | -1 | -4.3 | -0.9 | -0.1 | 2.2 | 1 | 1.4 | 0.2 | 1.7 | 4.9 | 7 | 6.6 | 6.8 | 5.2 | 6 | 2.7 | 0.2 | 6.1 | 7.3 | 7 | 3.6 | 6 | 7.7 | 6.2 | 2.9 |
| Apparent max temperature | -6.4 | -3.7 | -5.9 | -6.5 | -9.3 | -7.3 | -5.3 | -9.3 | -5.2 | -4.9 | -1.9 | -2.2 | -2.1 | -3.7 | -3 | -0.1 | 2.7 | 2.6 | 2.7 | 1.7 | 0.7 | -3.7 | -6.8 | 0.8 | 1 | 1.4 | -2.1 | 1.3 | 2.1 | 2 | -0.2 |
| Mean temperature | -4.4 | -2.3 | -2.7 | -4.4 | -5.8 | -3.6 | -2.6 | -5.3 | -3.2 | -1.1 | 1 | 0.5 | 0.5 | -1.3 | -0.1 | 3.4 | 6.4 | 6.1 | 5.8 | 3.8 | 3.3 | 1.1 | -0.6 | 0.2 | 5 | 4 | 1.4 | 3 | 5.7 | 3.9 | 0.9 |
| Apparent mean temperature | -13.6 | -8.4 | -10.1 | -11.5 | -11.6 | -11.5 | -10.6 | -11.4 | -9.5 | -6.9 | -5 | -2.9 | -4 | -8.6 | -8 | -2.9 | -0.3 | 1.2 | 0.9 | -4 | -4.6 | -6.8 | -8.2 | -7.8 | -3.7 | -3.8 | -5.6 | -6 | -0.7 | -2.3 | -4.8 |
| Minimum temperature | -8.4 | -4.7 | -4.8 | -6 | -6.5 | -6.2 | -5.3 | -6.6 | -4.4 | -1.7 | -0.2 | 0.1 | -0.1 | -4.8 | -4.1 | 1.7 | 5.1 | 5.6 | 5.1 | 1.7 | 0.9 | -0.5 | -1.9 | -2.7 | 2.3 | 1.9 | -2 | -1 | 4.1 | 1.9 | -0.3 |
| Apparent min temperature | -9.4 | -5.7 | -7.1 | -9.2 | -10.7 | -8.9 | -7.2 | -10.3 | -8 | -5.9 | -3 | -2.5 | -3 | -5.5 | -4.5 | -1.3 | 1.7 | 1.8 | 1.5 | -0.7 | -1.8 | -5.6 | -7.4 | -4.9 | -1.4 | -1 | -3.9 | -1.7 | 0.7 | -0.7 | -2.9 |
| 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) | 7.8 | 7.8 | 7.7 | 7.7 | 7.7 | 7.7 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.5 | 7.5 | 7.5 |
| Sunshine duration (h) | 2.1 | 0.5 | 3.6 | 4.6 | 3.4 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1.2 | 0 | 0.3 | 0 | 0 | 0 | 0 | 3 | 0 | 2.5 | 1.3 | 3.3 | 4 | 2.4 | 5.7 | 1.5 | 0 | 2.6 | 0 |
| Precipitation (mm) | 0 | 0.2 | 0.6 | 0 | 0 | 0 | 1.8 | 0 | 0.5 | 0.7 | 5.4 | 0.9 | 0 | 0.6 | 1.5 | 0.2 | 2.7 | 7.7 | 8.3 | 3.6 | 8.5 | 6.9 | 1.2 | 3.2 | 1.2 | 4.7 | 0.3 | 0.4 | 2.4 | 4.1 | 0 |
| Precipitation hours | 0 | 2 | 5 | 0 | 0 | 0 | 11 | 0 | 5 | 6 | 16 | 7 | 0 | 5 | 8 | 2 | 14 | 17 | 14 | 11 | 10 | 14 | 10 | 10 | 5 | 15 | 3 | 1 | 7 | 8 | 0 |
| Wind speed (m/s) | 19.4 | 9.1 | 17.9 | 17.2 | 17.9 | 19.7 | 16.5 | 16.3 | 16 | 19.5 | 18.4 | 10.5 | 12.8 | 16.1 | 19.5 | 28 | 30.3 | 26.6 | 26.7 | 28.7 | 31.3 | 36.1 | 34.3 | 28.8 | 38.6 | 33.5 | 29.5 | 25.1 | 28.1 | 24.5 | 17.1 |
In December 2023, the highest daytime temperature in Olsztyn was 7.7°C.
While the minimum temperature at night dropped to -8.4°C.
The average nighttime and daytime temperatures during December in Olsztyn are -1.3°C and 2.4°C respectively.
The precipitation sum in December is about 68 mm.