Average temperature in December is 10.6 °C
Average daytime temperature is 11.5 °C
Average night temperature is 9.6 °C
Absolute maximum temperature: 13.8 °C
Absolute minimum temperature: 5.3 °C
Number of sunny days: 6
Number of rainy days: 25
Number of snow days:
Precipitation sum: 111 mm
* Weather data for Saint Helier Jersey 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 | 7.2 | 7.3 | 10.9 | 11.4 | 9.8 | 9 | 12.7 | 12.3 | 13.8 | 13.7 | 12.6 | 12.4 | 10.5 | 11.8 | 11.6 | 11.2 | 10.1 | 11.4 | 12.8 | 11.9 | 12.1 | 11.8 | 11.9 | 12.3 | 12.6 | 11.8 | 12.5 | 11.8 | 11.8 | 12.1 | 10.9 |
| Apparent max temperature | 2.4 | 2.8 | 4.9 | 7.7 | 5.8 | 6 | 8.6 | 7.8 | 7.7 | 7.5 | 10.1 | 8.8 | 6.4 | 9 | 8.8 | 8.5 | 6.4 | 7.1 | 7.2 | 5.5 | 6.3 | 5.9 | 6.2 | 6.5 | 7.1 | 10.8 | 6.4 | 5.5 | 6.6 | 6.5 | 1.8 |
| Mean temperature | 6.7 | 6.3 | 9.5 | 10.3 | 9.3 | 8.1 | 9.7 | 11.6 | 12.4 | 12.3 | 12.1 | 11.6 | 9.8 | 10.5 | 11.1 | 10 | 8.3 | 10.5 | 11.4 | 11.2 | 11.9 | 11.3 | 11.4 | 12.1 | 12 | 11.2 | 11.8 | 11.4 | 11.4 | 11.3 | 9.5 |
| Apparent mean temperature | 0.4 | -0.4 | -0.4 | 0.6 | 0.2 | 0.9 | 0.5 | 5.6 | 2.4 | 4.8 | 6.2 | 3.5 | 1.9 | 2.4 | 6.3 | 4.5 | 2.5 | 4.9 | 3.5 | 4 | 3.6 | 3.3 | 4.9 | 4.6 | 5.5 | 5.7 | 4.5 | 4.4 | 4.5 | 1.8 | -3.2 |
| Minimum temperature | 5.8 | 5.3 | 6.9 | 9.2 | 8.7 | 7.1 | 7.9 | 11 | 11.3 | 10.9 | 11.6 | 10.5 | 8.7 | 8.6 | 10.6 | 8.7 | 7.2 | 9.5 | 10 | 10.5 | 11.7 | 10.8 | 10.8 | 10.9 | 11.6 | 10.4 | 11.2 | 11 | 10.9 | 10.6 | 8.6 |
| Apparent min temperature | 1.6 | 1.3 | 2.9 | 3.6 | 2.7 | 3.6 | 3.1 | 6.3 | 5.3 | 6 | 8.4 | 6 | 3.8 | 6.7 | 7.8 | 6.5 | 4.1 | 5.8 | 5.9 | 4.8 | 4.8 | 4.5 | 5.6 | 5.5 | 6.3 | 8.4 | 5.4 | 4.7 | 5.3 | 5 | -0.1 |
| 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) | 8.5 | 8.5 | 8.5 | 8.4 | 8.4 | 8.4 | 8.4 | 8.3 | 8.3 | 8.3 | 8.3 | 8.3 | 8.3 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.3 | 8.3 |
| Sunshine duration (h) | 7.2 | 7.2 | 5.2 | 1.8 | 7 | 4.5 | 0.2 | 7 | 3.3 | 0.7 | 4.9 | 5.6 | 5.2 | 0.7 | 4.8 | 3.7 | 6.9 | 0.6 | 0 | 4.4 | 4 | 5.2 | 3.3 | 1.8 | 0 | 4.8 | 0 | 6.7 | 5.6 | 6 | 3.5 |
| Precipitation (mm) | 0.5 | 0.5 | 11.6 | 9.6 | 5.8 | 1.3 | 7.9 | 0.7 | 15.8 | 5.9 | 0.1 | 10.6 | 2.1 | 1.6 | 0 | 0 | 0 | 0.2 | 2.2 | 0 | 0 | 0 | 0.1 | 0.6 | 2 | 0.7 | 4.1 | 0.3 | 7.8 | 3.4 | 16 |
| Precipitation hours | 5 | 5 | 19 | 20 | 12 | 4 | 17 | 5 | 15 | 9 | 1 | 17 | 9 | 9 | 0 | 0 | 0 | 2 | 8 | 0 | 0 | 0 | 1 | 5 | 11 | 3 | 4 | 3 | 15 | 3 | 21 |
| Wind speed (m/s) | 29.3 | 40.8 | 52.3 | 53.4 | 54.3 | 41.9 | 50 | 37.7 | 58.4 | 53.6 | 43.4 | 44.5 | 42.3 | 32.4 | 22.7 | 21.7 | 24.8 | 29.6 | 40.5 | 45.4 | 54.3 | 50.6 | 43.3 | 48.7 | 43 | 41.5 | 52.1 | 46.9 | 44.8 | 60.2 | 75.3 |
In December 2023, the highest daytime temperature in Saint Helier was 13.8°C.
While the minimum temperature at night dropped to 5.3°C.
The average nighttime and daytime temperatures during December in Saint Helier are 9.6°C and 11.5°C respectively.
The precipitation sum in December is about 111 mm.