December Weather in Mount Vernon

Last updated: March 2, 2024

The weather in Mount Vernon, United States, during December is characterized by an average temperature of 3°C (38°F). Highs can soar to 10°C (51°F), while lows may dip to -6°C (21°F). Typically, the humidity level in Mount Vernon throughout December hovers around 89%.

-6°C (21°F)

Minimum temperature

3°C (38°F)

Average temperature

10°C (51°F)

Maximum temperature

89%

Humidity

Precipitation and Sunshine hours

In December, Mount Vernon averages 271 mm (10.7 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 8 hours 21 minutes of daylight, with the sun shining for approximately 3 hours 8 minutes each day. Additionally, there is a 15% probability of sunny days during this period.

271 mm (10.7 inches)

Precipitation

19 rainy days

Rainy days

3 hours 8 minutes

Sunshine hours

15%

Chance of sun

UV Index

In December, the UV Index in Mount Vernon reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 1 2 1 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

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