December weather forecast
Brentwood, CA

Scenic and organized home community in Brentwood City, California
Scenic and organized home community in Brentwood City, California

Weather in December

December, the first month of the winter in Brentwood, is still a cool month, with an average temperature fluctuating between 55°F (12.8°C) and 41.7°F (5.4°C).

Temperature

December is the coldest month, with an average high-temperature of 55°F (12.8°C) and an average low-temperature of 41.7°F (5.4°C).

Humidity

The average relative humidity in December is 71%.

Rainfall

In December, in Brentwood, California, the rain falls for 9.3 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. Throughout the year, there are 62 rainfall days, and 10.16" (258mm) of precipitation is accumulated.

Snowfall

The only month with snowfall in Brentwood is December. The month with the most snowfall days is December, when snow falls for 0.1 days.

Daylight

With an average of 9h and 35min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:04 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:57 pm PST.

Sunshine

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

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Brentwood. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Brentwood?

With an average high-temperature of 55°F (12.8°C) and an average low-temperature of 41.7°F (5.4°C), December is the coldest month in Brentwood, California.

What is the average humidity in December in Brentwood?

In Brentwood, the average relative humidity in December is 71%.

How many days does it rain in December in Brentwood?

In Brentwood, in December, during 9.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

What is the snowiest month in Brentwood?

December has the most snowfall days of the year in Brentwood, California. Snow falls for 0.1 days.

When does it start to snow in Brentwood?

December is the first month it typically snows in Brentwood. Throughout December, there are 0.1 snowfall days.

What is the month with the shortest days in Brentwood?

The month with the shortest days in Brentwood, California, is December, with an average of 9h and 35min of daylight.

How many hours of daylight does Brentwood have in December?

In Brentwood, the average day length in December is 9h and 35min.

When is the sunrise / sunset in December in Brentwood?

On the first day of December in Brentwood, California, sunrise is at 7:04 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:57 pm PST.

What is the month with the least sunshine in Brentwood?

With an average of 5.8h of sunshine, December has the least sunshine of the year in Brentwood, California.

How long on average sun shines in December in Brentwood?

In December, the average sunshine duration in Brentwood is 5.8h.

What are the months with the lowest UV index in Brentwood?

The months with the lowest UV index in Brentwood are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Brentwood?

The average daily maximum UV index in December in Brentwood, California, is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Brentwood, CA

Average temperature in December - Brentwood, CA
  • Average high temperature in December: 55°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in December: 41.7°F

The month with the highest average low temperature is September (57.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in December
Brentwood, CA

Average pressure in December - Brentwood, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Brentwood, CA

Average wind speed in December - Brentwood, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is June (7.8mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).

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Average humidity in December
Brentwood, CA

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

The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is September (52%).

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Average rainfall in December
Brentwood, CA

Average rainfall in December - Brentwood, CA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Brentwood, CA

Average rainfall days in December - Brentwood, CA
  • Average rainfall days in December: 9.3 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.8 days).

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Average snowfall days in December
Brentwood, CA

Average snowfall days in December - Brentwood, CA
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in December / Average sunshine in December - Brentwood, CA
  • Average daylight in December: 9h and 35min

The month with the longest days is June (Average daylight: 14h and 45min).
The month with the shortest days is December (Average daylight: 9h and 35min).

  • Average sunshine in December: 5h and 48min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Brentwood, CA

Average sunshine days in December - Brentwood, CA
  • Average sunshine days in December: 21.1 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.7 days).

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Average UV index in December
Brentwood, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Brentwood, CA

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

The months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in December
Brentwood, CA

Average visibility in December - Brentwood, CA
  • Average visibility in December: 6mi

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

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