Average temperature in December is 0.9 °C
Average daytime temperature is 4.6 °C
Average night temperature is -2.2 °C
Absolute maximum temperature: 13 °C
Absolute minimum temperature: -11 °C
Number of sunny days: 18
Number of rainy days: 12
Number of snow days: 1
Precipitation sum: 167 mm
* Weather data for Belfast United States 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 | 10.3 | 8.9 | 3.3 | 1.7 | -0.5 | -2.1 | -2.8 | 1.1 | 6 | 10.7 | 12.4 | 2 | 3.7 | -1.1 | 7.9 | 4.8 | 6.6 | 13 | 12.8 | 3.5 | 0.3 | -1.7 | 3.7 | 6.8 | 8.7 | 6.5 | 3.7 | 5.1 | 3.5 | 1.8 | 1.2 |
| Apparent max temperature | 7.5 | 6.9 | 0.1 | -2.5 | -4.2 | -7 | -7.6 | -3.7 | 3 | 7.7 | 9.6 | -2.6 | -1.6 | -6.6 | 4 | 0.5 | 2.6 | 7.7 | 11 | -1.1 | -5.5 | -7.4 | -1.3 | 3.9 | 6.9 | 4.6 | 1.4 | 1.7 | 0 | -0.9 | -2.7 |
| Mean temperature | 4.8 | 5.3 | 1.9 | 0 | -2.4 | -6.3 | -7.2 | -6 | -1.1 | 6.8 | 7.2 | -0.3 | 1.1 | -4.2 | 0.5 | 2.8 | 2.3 | 10.2 | 7.9 | 0.3 | -3.1 | -5.5 | -2.9 | 1.5 | 2.5 | 3.3 | 2.8 | 3.2 | 1.9 | 1.3 | -0.5 |
| Apparent mean temperature | -2.7 | -2.5 | -2.6 | -5.2 | -10.5 | -13.9 | -16.3 | -15.3 | -10 | 0.7 | -1.7 | -8.5 | -6.9 | -13.1 | -9.1 | -5.4 | -6.1 | 2.7 | -0.2 | -8.8 | -13.1 | -14.1 | -11.4 | -5.5 | -4.7 | -1.7 | -1 | -1.4 | -3 | -3.3 | -7.7 |
| Minimum temperature | 1.8 | 1.1 | 1.2 | -1 | -5.5 | -9.2 | -11 | -10 | -6.4 | 3.8 | 2.5 | -4.1 | -2.1 | -7.3 | -4.3 | -1.4 | -2 | 5.8 | 3.7 | -3.5 | -5.9 | -7.9 | -7.1 | -1.4 | -1.6 | 1.5 | 1.6 | 1.7 | 1.3 | 0.7 | -3 |
| Apparent min temperature | 0.8 | 2.8 | -1.7 | -4.2 | -7.2 | -11 | -12.5 | -11.2 | -4.7 | 4.1 | 3.9 | -5.1 | -3.9 | -9.8 | -4.2 | -1.2 | -1.6 | 5.7 | 4.8 | -4.8 | -9.8 | -11.6 | -7.2 | -2.1 | -0.2 | 0.6 | 0.3 | 0.1 | -1.8 | -1.9 | -4.8 |
| 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) | 9.1 | 9.1 | 9.1 | 9 | 9 | 9 | 9 | 9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.8 | 8.8 | 8.8 | 8.8 | 8.8 | 8.8 | 8.8 | 8.8 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 |
| Sunshine duration (h) | 7.6 | 3.7 | 0 | 0 | 7.4 | 7.5 | 7.8 | 7.8 | 0 | 0 | 1.8 | 7.8 | 7.7 | 7.7 | 7.7 | 7.5 | 0 | 0 | 4.5 | 7.3 | 7.7 | 7.7 | 7.4 | 7.5 | 4.2 | 0.7 | 0 | 0 | 0 | 0 | 7.7 |
| Precipitation (mm) | 0 | 2.1 | 1.8 | 13.2 | 1.4 | 0 | 0 | 0 | 0 | 1.6 | 59.4 | 0 | 0 | 0 | 0 | 0 | 0.2 | 50 | 2.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.1 | 5.9 | 14.8 | 6.3 | 0 |
| Precipitation hours | 0 | 5 | 6 | 21 | 11 | 0 | 0 | 0 | 0 | 3 | 19 | 0 | 0 | 0 | 0 | 0 | 2 | 20 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18 | 11 | 21 | 14 | 0 |
| Wind speed (m/s) | 18.4 | 11.8 | 16.1 | 17.8 | 16.6 | 13.1 | 16.9 | 13.7 | 11.4 | 20.8 | 27.8 | 18.1 | 18.4 | 19.6 | 15.6 | 15.5 | 22.9 | 50.5 | 40.5 | 19.7 | 26 | 21.4 | 10.4 | 10.3 | 9.4 | 10.2 | 9.2 | 14.5 | 17.5 | 16 | 14.6 |
In December 2023, the highest daytime temperature in Belfast was 13°C.
While the minimum temperature at night dropped to -11°C.
The average nighttime and daytime temperatures during December in Belfast are -2.2°C and 4.6°C respectively.
The precipitation sum in December is about 167 mm.