December Weather in Mountain View

Last updated: March 2, 2024

The weather in Mountain View, United States, during December is characterized by an average temperature of 7°C (44°F). Highs can soar to 23°C (74°F), while lows may dip to -8°C (19°F). Typically, the humidity level in Mountain View throughout December hovers around 84%.

-8°C (19°F)

Minimum temperature

7°C (44°F)

Average temperature

23°C (74°F)

Maximum temperature

84%

Humidity

Precipitation and Sunshine hours

In December, Mountain View averages 29 mm (1.1 inches) of rainfall, typically over the course of 3 rainy days. The month enjoys an average of 9 hours 49 minutes of daylight, with the sun shining for approximately 7 hours 43 minutes each day. Additionally, there is a 58% probability of sunny days during this period.

29 mm (1.1 inches)

Precipitation

3 rainy days

Rainy days

7 hours 43 minutes

Sunshine hours

58%

Chance of sun

UV Index

In December, the UV Index in Mountain View reaches a maximum of 4, 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 3 4 4 3 2 1 1 0 0
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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