December weather forecast
Oakley, CA

Weather in December

The first month of the winter, December, is also a fresh month in Oakley, California, with an average temperature ranging between min 41.7°F (5.4°C) and max 55°F (12.8°C).

Temperature

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.

Humidity

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

Rainfall

In December, 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 Oakley is December. December has the most snowfall days of the year in Oakley. Snow falls for 0.1 days.

Daylight

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

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Oakley?

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

What is the temperature in December in Oakley?

The average high-temperature, in December, in Oakley, is 55°F (12.8°C), while the average low-temperature is 41.7°F (5.4°C). in September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, is calculated to be 87.8°F (31°C).

What is the average humidity in December in Oakley?

In December, the average relative humidity is 71%.

How much does it rain in Oakley in December?

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

When does it snow the most in Oakley?

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

When does it start to snow in Oakley?

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

What is the month with the shortest days in Oakley?

December has the shortest days of the year, with an average of 9h and 35min of daylight.

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

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

When are sunrise and sunset in December in Oakley?

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

What is the month with the least sunshine in Oakley?

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

How long on average sun shines in December in Oakley?

The average sunshine duration in December in Oakley, California, is 5.8h.

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

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

How high is the UV index in December in Oakley?

In Oakley, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's 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
Oakley, CA

Average temperature in December - Oakley, 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
Oakley, CA

Average pressure in December - Oakley, 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
Oakley, CA

Average wind speed in December - Oakley, 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
Oakley, CA

Average humidity in December - Oakley, 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
Oakley, CA

Average rainfall in December - Oakley, 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
Oakley, CA

Average rainfall days in December - Oakley, 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
Oakley, CA

Average snowfall days in December - Oakley, 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
Oakley, CA

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

The month with the longest days is June (Average daylight: 14h and 46min).
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
Oakley, CA

Average sunshine days in December - Oakley, 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
Oakley, CA

Average UV index in December - Oakley, 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
Oakley, CA

Average cloud cover in December - Oakley, 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
Oakley, CA

Average visibility in December - Oakley, 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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