Average temperature in December is 8.3 °C
Average daytime temperature is 9.6 °C
Average night temperature is 7.1 °C
Absolute maximum temperature: 12.5 °C
Absolute minimum temperature: 1.8 °C
Number of sunny days: 2
Number of rainy days: 29
Number of snow days:
Precipitation sum: 194 mm
* Weather data for Castletown Isle of Man 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 | 5.2 | 5.5 | 5.5 | 5.7 | 6.4 | 6.7 | 10.8 | 10.1 | 11.4 | 10.2 | 8.9 | 10.2 | 8 | 10 | 11.3 | 11.4 | 11.8 | 12.5 | 9.6 | 11.5 | 11.9 | 10.6 | 12.2 | 12.5 | 9.8 | 8.3 | 12 | 9.3 | 8.2 | 10.6 | 9.6 |
| Apparent max temperature | 2.7 | 2.4 | 2.9 | 0.5 | 3.1 | 1.9 | 6.6 | 5.8 | 6.5 | 5.9 | 7.8 | 7.6 | 4.1 | 5.6 | 7.4 | 7.4 | 8.1 | 9.4 | 6.6 | 5.8 | 5.5 | 4.3 | 7.5 | 7.4 | 4.8 | 4.4 | 6.9 | 2.3 | 0.5 | 5 | 4.7 |
| Mean temperature | 3.1 | 4.1 | 3.5 | 4.4 | 5.5 | 6.2 | 8.9 | 9.6 | 9.6 | 8.8 | 8.2 | 8.8 | 6.3 | 9.1 | 9.9 | 10.9 | 11.1 | 11.6 | 8.5 | 10.1 | 10.3 | 10 | 10.8 | 11.2 | 9.2 | 7.2 | 8.8 | 8.3 | 7 | 7.5 | 7.4 |
| Apparent mean temperature | -3.5 | -0.4 | -2.5 | -2.7 | 0.1 | -0.8 | -0.4 | 3 | -0.6 | 2.1 | 3.1 | 3.6 | 1 | 3.2 | 4.1 | 5.1 | 3.2 | 6.5 | 1.2 | 1.7 | 0.9 | 2.4 | 3.3 | 3.6 | 1.2 | 0.6 | -1.6 | -0.7 | -1.4 | -1.3 | 0.4 |
| Minimum temperature | 0 | 2.5 | 1.8 | 2.2 | 4.9 | 5.9 | 6.9 | 9.2 | 8.6 | 7.7 | 7.5 | 7.3 | 3.8 | 8.1 | 8.5 | 10 | 10.4 | 9.8 | 7.9 | 8.6 | 8.8 | 9.3 | 9.8 | 9 | 8.2 | 5.2 | 6.7 | 6.4 | 5.4 | 4.8 | 6.5 |
| Apparent min temperature | -0.1 | 0.8 | -0.1 | -0.8 | 1.3 | 0.3 | 2.8 | 4.2 | 3.2 | 3.9 | 5.1 | 5.8 | 2.6 | 4.6 | 5.6 | 6.5 | 5.5 | 8 | 3.1 | 4.2 | 3 | 3.3 | 4.8 | 5.7 | 3.4 | 2.5 | 1.6 | 0.8 | -0.4 | 2 | 2 |
| 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 | 7.7 | 7.7 | 7.7 | 7.6 | 7.6 | 7.6 | 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 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 | 7.4 |
| Sunshine duration (h) | 6.1 | 3.9 | 5.5 | 0 | 2.4 | 1.5 | 0 | 0.5 | 1 | 2 | 3.3 | 1.2 | 5.7 | 5.7 | 4 | 0 | 2.1 | 0 | 5.6 | 0 | 3.4 | 0 | 1.1 | 1.8 | 0 | 4.6 | 0 | 4.1 | 3.9 | 0 | 2.7 |
| Precipitation (mm) | 0.2 | 11.1 | 0 | 4.6 | 2.3 | 4 | 12.7 | 9 | 18.1 | 18.6 | 3.9 | 12.5 | 0.3 | 2.7 | 0.4 | 0.3 | 4.2 | 2.3 | 1.2 | 1 | 0 | 0.2 | 3.4 | 3.5 | 4.1 | 0.2 | 34.9 | 8.1 | 2.9 | 20.4 | 7.1 |
| Precipitation hours | 1 | 19 | 0 | 17 | 10 | 6 | 16 | 12 | 16 | 15 | 13 | 16 | 2 | 7 | 4 | 3 | 11 | 14 | 4 | 4 | 0 | 2 | 7 | 18 | 13 | 2 | 20 | 8 | 6 | 11 | 16 |
| Wind speed (m/s) | 11.2 | 17.1 | 18.6 | 29 | 25.8 | 40.5 | 45.2 | 40 | 56.8 | 34.6 | 30.3 | 31.9 | 23.4 | 29 | 27.2 | 34.5 | 45 | 30.1 | 37.8 | 39.3 | 49.4 | 46.1 | 44 | 40.9 | 40.1 | 40 | 54.4 | 52.4 | 48.7 | 40.7 | 38.2 |
In December 2023, the highest daytime temperature in Castletown was 12.5°C.
While the minimum temperature at night dropped to 1.8°C.
The average nighttime and daytime temperatures during December in Castletown are 7.1°C and 9.6°C respectively.
The precipitation sum in December is about 194 mm.