December Weather in Ontario

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%.

-9°C (15°F)

Minimum temperature

1°C (34°F)

Average temperature

13°C (55°F)

Maximum temperature

86%

Humidity

Precipitation and Sunshine hours

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.

113 mm (4.4 inches)

Precipitation

20 rainy days

Rainy days

3 hours 45 minutes

Sunshine hours

21%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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