Average temperature in December is 3.8 °C
Average daytime temperature is 8.4 °C
Average night temperature is 0.6 °C
Absolute maximum temperature: 15.7 °C
Absolute minimum temperature: -5 °C
Number of sunny days: 18
Number of rainy days: 12
Number of snow days: 1
Precipitation sum: 83 mm
* Weather data for Ontario United States is based on climate observations for 2023 year
| Dicembre (°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 | 5.9 | 4.5 | 7.5 | 8.8 | 7.5 | 11.1 | 15.7 | 14.5 | 10.1 | 6.6 | 8.8 | 5.4 | 8.6 | 8.7 | 6.6 | 6.5 | 10.5 | 6.1 | 8.2 | 11.6 | 12.7 | 14.8 | 13 | 13.7 | 6.7 | 1.3 | 2.5 | 4.1 | 6.3 | 8.6 | 4.2 |
| Apparent max temperature | 0.8 | 0.7 | 3.4 | 4.4 | 2.4 | 5.7 | 11.3 | 10.7 | 5.9 | 1.6 | 4.5 | 0.8 | 5.6 | 5.4 | 5.1 | 4.9 | 6 | 2.1 | 2.1 | 9 | 10.6 | 13.1 | 11 | 11.5 | 2.5 | -2.5 | -2.9 | -1 | 1.5 | 4.7 | 0.2 |
| Mean temperature | 2.2 | -0.4 | 1.1 | 1.7 | 4.2 | 2.5 | 10 | 10.8 | 5.6 | 1.5 | 2.8 | 2.9 | 2.2 | 2.6 | 5.7 | 5.1 | 3.5 | 1.8 | 1.2 | 5.7 | 10.1 | 11.4 | 5.9 | 13 | 1.9 | -0.7 | -0.2 | 0.4 | 1.9 | 2.1 | 0.2 |
| Apparent mean temperature | -5.6 | -9 | -6.7 | -6.8 | -4.4 | -6.9 | 1.8 | 2.5 | -3.3 | -8.1 | -6.5 | -5.7 | -6 | -5.5 | 0.2 | -1 | -5 | -8.4 | -7.7 | -1.6 | 5.6 | 8.2 | -1 | 5.5 | -5.8 | -6.9 | -7.2 | -6.3 | -5.8 | -5.2 | -7.5 |
| Minimum temperature | -0.1 | -5 | -2.4 | -2.9 | 1.4 | -2.4 | 6.5 | 6.7 | 2.3 | -3.3 | -1.5 | -0.4 | -2 | -1.3 | 3.3 | 3.4 | -1.2 | -2.8 | -3.3 | 2.2 | 7.7 | 9.7 | 2.6 | 8.3 | -0.1 | -1.6 | -1.4 | -0.8 | -0.1 | -0.8 | -1.7 |
| Apparent min temperature | -3 | -3.9 | -2.5 | -2.5 | -0.9 | -2 | 5.7 | 7.2 | 0.3 | -3.9 | -1.8 | -1.6 | -1.8 | -1.1 | 3.1 | 1.8 | -0.3 | -3.2 | -4.1 | 1.7 | 8 | 10 | 3.2 | 10.5 | -3.2 | -5.6 | -5.4 | -4.6 | -3.2 | -2 | -4.9 |
| Dicembre | 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) | 9.6 | 9.6 | 9.6 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 |
| Sunshine duration (h) | 1.7 | 6.2 | 5.8 | 8.1 | 8.5 | 8.4 | 8.5 | 7.4 | 8.4 | 7.9 | 8.4 | 6 | 8.2 | 5.9 | 0 | 0.4 | 8.4 | 8.4 | 7.8 | 4.6 | 0 | 3.8 | 0.2 | 0 | 0 | 0.2 | 2.6 | 4.5 | 8.4 | 5.9 | 2.2 |
| Precipitation (mm) | 12.3 | 0 | 0.8 | 0.1 | 0.1 | 0 | 0 | 0 | 2.8 | 0 | 0 | 0 | 0 | 0 | 13.3 | 2.9 | 0 | 0 | 0 | 0 | 0.3 | 5 | 0 | 20.3 | 20.2 | 3.4 | 1.2 | 0 | 0 | 0 | 0 |
| Precipitation hours | 9 | 0 | 3 | 1 | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 13 | 11 | 0 | 0 | 0 | 0 | 2 | 13 | 0 | 15 | 17 | 18 | 8 | 0 | 0 | 0 | 0 |
| Wind speed (m/s) | 24.8 | 9.8 | 15 | 20 | 25.5 | 23.1 | 28.5 | 22.1 | 30.8 | 22.9 | 16.3 | 17.3 | 12.6 | 12.3 | 11.7 | 22.6 | 16.3 | 22.3 | 24.1 | 20.9 | 12.3 | 14.5 | 21.2 | 27 | 23.1 | 19.8 | 26.1 | 19.3 | 21.2 | 15.6 | 21.6 |
In December 2023, the highest daytime temperature in Ontario was 15.7°C.
While the minimum temperature at night dropped to -5°C.
The average nighttime and daytime temperatures during December in Ontario are 0.6°C and 8.4°C respectively.
The precipitation sum in December is about 83 mm.