December Weather in Cornwall

Last updated: March 2, 2024

The weather in Cornwall, Canada, during December is characterized by an average temperature of -3°C (26°F). Highs can soar to 12°C (53°F), while lows may dip to -20°C (-3°F). Typically, the humidity level in Cornwall throughout December hovers around 89%.

-20°C (-3°F)

Minimum temperature

-3°C (26°F)

Average temperature

12°C (53°F)

Maximum temperature

89%

Humidity

Precipitation and Sunshine hours

In December, Cornwall averages 84 mm (3.3 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 8 hours 48 minutes of daylight, with the sun shining for approximately 4 hours 20 minutes each day. Additionally, there is a 22% probability of sunny days during this period.

84 mm (3.3 inches)

Precipitation

12 rainy days

Rainy days

4 hours 20 minutes

Sunshine hours

22%

Chance of sun

UV Index

In December, the UV Index in Cornwall 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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