Average temperature in December is 1.1 °C
Average daytime temperature is 5.5 °C
Average night temperature is -1.7 °C
Absolute maximum temperature: 12.1 °C
Absolute minimum temperature: -8.2 °C
Number of sunny days: 18
Number of rainy days: 8
Number of snow days: 5
Precipitation sum: 34 mm
* Weather data for Sumner 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 | 2.7 | 3.8 | 3.3 | 3.8 | 2 | 5.8 | 10.1 | 11.1 | 6 | 0.4 | 2.4 | -0.1 | 5.3 | 7.8 | 7.9 | 5.8 | 5.4 | 2 | 1.4 | 5.6 | 5.1 | 10.4 | 11 | 12.1 | 11.9 | 10.9 | 4 | 3 | 4.6 | 4 | 0.1 |
| Apparent max temperature | -3.3 | -0.4 | -0.6 | -1.4 | -3.2 | -0.4 | 6.2 | 7 | 2.8 | -4.9 | -2.5 | -5.9 | -0.3 | 3.3 | 4.5 | 2.8 | 1.8 | -3 | -4.7 | 0.8 | 1.4 | 7.9 | 7.8 | 8.2 | 8.8 | 7.6 | -0.7 | -1.3 | 0.2 | -1.3 | -6.4 |
| Mean temperature | -0.9 | -0.7 | 0.5 | -1.5 | -0.2 | -1.5 | 3.6 | 7.3 | 3.2 | -2.8 | -4.7 | -2.1 | -2.5 | 0.5 | 3.2 | 4.2 | 3.3 | -3.1 | -5 | -0.2 | 1.8 | 5.2 | 7.1 | 8.5 | 11.1 | 2.9 | 0.2 | -0.1 | -0.6 | -1.1 | -2 |
| Apparent mean temperature | -9.2 | -8.1 | -4.8 | -8.8 | -6.5 | -9.9 | -3.8 | 0.2 | -6.1 | -11.5 | -12.2 | -11.4 | -11.5 | -7 | -3.1 | -0.5 | -2.3 | -15.2 | -14.3 | -8.1 | -5.3 | -0.6 | 3.2 | 3.1 | 5.9 | -5.6 | -7.4 | -8.2 | -8.1 | -7.6 | -9.7 |
| Minimum temperature | -2.9 | -4.2 | -1.5 | -4.6 | -3 | -5.6 | -0.4 | 4.2 | 0.7 | -6.1 | -8.1 | -5.4 | -6.7 | -3.1 | 0.6 | 3.2 | 1.8 | -6.2 | -8.2 | -3.7 | -0.3 | 2.5 | 5.5 | 6.2 | 10.1 | 0.1 | -3 | -3.1 | -3.2 | -3.5 | -3.9 |
| Apparent min temperature | -6.5 | -5 | -2.9 | -5.2 | -4.7 | -6.2 | -0.6 | 3.3 | -1.8 | -8.6 | -8.8 | -7.8 | -7.5 | -3.9 | -0.6 | 1 | -0.7 | -10.5 | -10.7 | -5.1 | -2.9 | 2.2 | 4.7 | 4.8 | 7.4 | -2 | -4.2 | -5.5 | -5.5 | -5.6 | -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) | 9.3 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9.1 | 9.1 | 9.1 |
| Sunshine duration (h) | 2.2 | 3.4 | 2.6 | 6.2 | 1.9 | 6 | 8 | 6.6 | 0 | 8 | 8 | 8 | 7.9 | 7.9 | 3.3 | 0 | 7.7 | 7.9 | 5.1 | 7.9 | 0.3 | 2 | 3 | 0.1 | 0 | 0 | 0.9 | 0 | 7.9 | 6.8 | 3.1 |
| Precipitation (mm) | 0 | 0 | 1 | 0 | 1.4 | 0 | 0 | 0 | 0.7 | 0 | 0 | 0 | 0 | 0 | 0 | 4.8 | 0.4 | 0 | 0 | 0 | 0 | 0.2 | 0.1 | 0.3 | 17.4 | 5.5 | 0.4 | 0.5 | 0 | 0 | 1.4 |
| Precipitation hours | 0 | 0 | 4 | 0 | 4 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 2 | 0 | 0 | 0 | 0 | 2 | 1 | 2 | 20 | 6 | 2 | 4 | 0 | 0 | 8 |
| Wind speed (m/s) | 23 | 14.7 | 10.2 | 18.3 | 20.7 | 24.3 | 22.5 | 22.7 | 30.3 | 31.3 | 12.6 | 20.1 | 14.3 | 13.2 | 14.8 | 15.8 | 20.9 | 36.7 | 23.8 | 17.8 | 17.7 | 14.7 | 16.4 | 28.2 | 31.1 | 28 | 17.1 | 22.8 | 23 | 22 | 26.3 |
In December 2023, the highest daytime temperature in Sumner was 12.1°C.
While the minimum temperature at night dropped to -8.2°C.
The average nighttime and daytime temperatures during December in Sumner are -1.7°C and 5.5°C respectively.
The precipitation sum in December is about 34 mm.