December weather forecast and climate
Berkeley, CA

the neon-lit iconic Berkeley University Sather Tower in California
the neon-lit iconic Berkeley University Sather Tower in California

Weather in December

December, the first month of the winter, in Berkeley, is still a mild month, with average temperature ranging between max 55.4°F (13°C) and min 44.6°F (7°C).

Temperature

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 44.6°F (7°C), December is the coldest month.

Humidity

The average relative humidity is 71%.

Rainfall

In Berkeley, during 7.5 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 55.6 rainfall days, and 5.24" (133mm) of precipitation is accumulated.

Daylight

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

Sunshine

December has the least sunshine of the year, with an average of 5.8h of sunshine.

UV index

Months with the lowest UV index in Berkeley are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Berkeley?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 44.6°F (7°C), December is the coldest month.

What is the temperature in December in Berkeley?

The average high-temperature, in December, is 55.4°F (13°C), while the average low-temperature is 44.6°F (7°C).

What is the average humidity in December in Berkeley?

The average relative humidity in December in Berkeley is 71%.

How much does it rain in Berkeley in December?

In Berkeley, in December, it is raining for 7.5 days, with typically 0.87" (22mm) of accumulated precipitation.

What is the month with the shortest days in Berkeley?

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

What is the average length of the day in December in Berkeley?

In Berkeley, the average length of the day in December is 9.6h.

What is the month with the least sunshine in Berkeley?

The month with the least sunshine in Berkeley is December, with an average of 5.8h of sunshine.

How many hours of sunshine does Berkeley have in December?

The average sunshine in December in Berkeley is 5.8h.

When is the lowest UV index in Berkeley?

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

What is the UV index intensity in December in Berkeley?

In December, the average daily maximum UV index in Berkeley is 3. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in December
Berkeley, CA

Average temperature in December - Berkeley, CA
  • Average high temperature in December: 55.4°F

The warmest month (with the highest average high temperature) is September (76.6°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in December: 44.6°F

The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).

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Average pressure in December
Berkeley, CA

Average pressure in December - Berkeley, 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, August and September (29.92").

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Average wind speed in December
Berkeley, CA

Average wind speed in December - Berkeley, CA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).

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Average humidity in December
Berkeley, CA

Average humidity in December - Berkeley, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (64%).

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Average rainfall in December
Berkeley, CA

Average rainfall in December - Berkeley, CA
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is February (1.1").
The driest months (with the least rainfall) are June, July, August and September (0.08").

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Average rainfall days in December
Berkeley, CA

Average rainfall days in December - Berkeley, CA
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (1.5 days).

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Average daylight in December /
Average sunshine in December
Berkeley, CA

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.8h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in December
Berkeley, CA

Average sunshine days in December - Berkeley, CA
  • Average sunshine days in December: 22.1 days

The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (20.5 days).

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Average UV index in December
Berkeley, CA

Average UV index in December - Berkeley, CA
  • Average UV index in December: 3

Months with the highest UV index are April, May, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Berkeley, CA

Average cloud cover in December - Berkeley, CA
  • Average cloud cover in December: 35

The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in December
Berkeley, CA

Average visibility in December - Berkeley, 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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