Last updated: March 2, 2024
The weather in Ontario, United States, during December is characterized by an average temperature of 1°C (34°F). Highs can soar to 13°C (55°F), while lows may dip to -9°C (15°F). Typically, the humidity level in Ontario throughout December hovers around 86%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Ontario averages 113 mm (4.4 inches) of rainfall, typically over the course of 20 rainy days. The month enjoys an average of 9 hours 1 minutes of daylight, with the sun shining for approximately 3 hours 45 minutes each day. Additionally, there is a 21% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In December, the UV Index in Ontario reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 45 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||