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 (45°F). Highs can soar to 21°C (69°F), while lows may dip to -6°C (22°F). Typically, the humidity level in Mountain View throughout December hovers around 87%.

-6°C (22°F)

Minimum temperature

7°C (45°F)

Average temperature

21°C (69°F)

Maximum temperature

87%

Humidity

Precipitation and Sunshine hours

In December, Mountain View averages 116 mm (4.6 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 9 hours 45 minutes of daylight, with the sun shining for approximately 6 hours 18 minutes each day. Additionally, there is a 45% probability of sunny days during this period.

116 mm (4.6 inches)

Precipitation

9 rainy days

Rainy days

6 hours 18 minutes

Sunshine hours

45%

Chance of sun

UV Index

In December, the UV Index in Mountain View reaches a maximum of 3, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, 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 3 3 2 2 1 1 0 0
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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