December Weather in Mount Washington

Last updated: March 2, 2024

The weather in Mount Washington, United States, during December is characterized by an average temperature of 5°C (42°F). Highs can soar to 20°C (68°F), while lows may dip to -8°C (18°F). Typically, the humidity level in Mount Washington throughout December hovers around 88%.

-8°C (18°F)

Minimum temperature

5°C (42°F)

Average temperature

20°C (68°F)

Maximum temperature

88%

Humidity

Precipitation and Sunshine hours

In December, Mount Washington averages 115 mm (4.5 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 9 hours 33 minutes of daylight, with the sun shining for approximately 5 hours 34 minutes each day. Additionally, there is a 38% probability of sunny days during this period.

115 mm (4.5 inches)

Precipitation

10 rainy days

Rainy days

5 hours 34 minutes

Sunshine hours

38%

Chance of sun

UV Index

In December, the UV Index in Mount Washington reaches a maximum of 3, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 30 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 2 2 3 3 2 1 1 1 0 0
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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