December weather forecast and climate
Mountain View, CA

A street in Mountain View Town, California, with neon-lit building, trees, and parked cars
A street in Mountain View Town, California, with neon-lit building, trees, and parked cars

Weather in December

December, the first month of the winter, in Mountain View, is still a mild month, with average temperature varying between 56.5°F (13.6°C) and 44.1°F (6.7°C).

Temperature

December is the coldest month, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 44.1°F (6.7°C).

Humidity

The average relative humidity in Mountain View is 71%.

Rainfall

The wettest months are February, March and December, with an average 0.83" (21mm) of rainfall.

Daylight

December has the shortest days of the year in Mountain View, with an average of 9.6h of daylight.

Sunshine

December has the least sunshine of the year in Mountain View, California, with an average of 5.9h of sunshine.

UV index

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Mountain View?

December is the coldest month in Mountain View, California, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 44.1°F (6.7°C).

What is the temperature in December in Mountain View?

The average high-temperature, in December, in Mountain View, is 56.5°F (13.6°C), while the average low-temperature is 44.1°F (6.7°C).

What is the average humidity in December in Mountain View?

In Mountain View, California, the average relative humidity in December is 71%.

How many days does it rain in December in Mountain View?

In Mountain View, California, in December, it is raining for 8.2 days, with typically 0.83" (21mm) of accumulated precipitation.

What is the wettest month in Mountain View?

The wettest months are February, March and December, with an average 0.83" (21mm) of rainfall.

What is the month with the shortest days in Mountain View?

December has the shortest days of the year in Mountain View, California, with an average of 9.6h of daylight.

How many hours of daylight does Mountain View have in December?

The average length of the day in December is 9.6h.

What is the month with the least sunshine in Mountain View?

The month with the least sunshine in Mountain View, California, is December, with an average of 5.9h of sunshine.

How many hours of sunshine does Mountain View have in December?

In December, the average sunshine in Mountain View, California, is 5.9h.

When is the lowest UV index in Mountain View?

Months with the lowest UV index in Mountain View are February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Mountain View?

The average daily maximum UV index in December in Mountain View, California, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
Mountain View, CA

Average temperature in December - Mountain View, CA
  • Average high temperature in December: 56.5°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (56.5°F).

  • Average low temperature in December: 44.1°F

The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).

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Average pressure in December
Mountain View, CA

Average pressure in December - Mountain View, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June and September (29.92").

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Average wind speed in December
Mountain View, CA

Average wind speed in December - Mountain View, CA
  • Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are April and May (6.2mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.7mph).

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Average humidity in December
Mountain View, CA

Average humidity in December - Mountain View, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (73%).
Months with the lowest relative humidity are July, September and October (63%).

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Average rainfall in December
Mountain View, CA

Average rainfall in December - Mountain View, CA
  • Average rainfall in December: 0.83"

The wettest months (with the highest rainfall) are February, March and December (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in December
Mountain View, CA

Average rainfall days in December - Mountain View, CA
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is March (10 days).
The month with the least rainy days is August (0.4 days).

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Average daylight in December /
Average sunshine in December
Mountain View, CA

Average daylight in December / Average sunshine in December - Mountain View, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.9h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in December
Mountain View, CA

Average sunshine days in December - Mountain View, CA
  • Average sunshine days in December: 21.9 days

Months with the most sunshine days are July and August (29.8 days).
The month with the least sunshine days is March (19.4 days).

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Average UV index in December
Mountain View, CA

Average UV index in December - Mountain View, CA
  • Average UV index in December: 3

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in December
Mountain View, CA

Average cloud cover in December - Mountain View, CA
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in December
Mountain View, CA

Average visibility in December - Mountain View, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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