December weather forecast
Pleasanton, CA

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Neon-lit buildings in the CBD of downtown Pleasanton, California
Neon-lit buildings in the CBD of downtown Pleasanton, California

Weather in December

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

Temperature

December is the month when Pleasanton sees the lowest average temperatures, with a high of 55°F (12.8°C) and a low of 41.7°F (5.4°C).

Humidity

In December, the average relative humidity is 71%.

Rainfall

In Pleasanton, California, during December, the rain falls for 10.4 days and regularly aggregates up to 1.81" (46mm) of precipitation. Throughout the year, in Pleasanton, there are 70.2 rainfall days, and 10.98" (279mm) of precipitation is accumulated.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year in Pleasanton.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:49 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:59 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the UV index of 3 transforms into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
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Frequently asked questions

What is the coldest month in Pleasanton?

December is the coldest month, exhibiting average temperatures of 55°F (12.8°C) at the peak and 41.7°F (5.4°C) at the base.

What is the average December temperature in Pleasanton?

The high-temperature in Pleasanton during December is 55°F (12.8°C) and the low-temperature is 41.7°F (5.4°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 84.2°F (29°C).

What is the average humidity in December in Pleasanton?

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

How many days does it rain in December in Pleasanton?

In Pleasanton, in December, during 10.4 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

What is the month with the shortest days in Pleasanton?

December has the shortest days of the year, with an average of 9h and 36min of daylight.

How many hours of daylight does Pleasanton have in December?

The average day length in December in Pleasanton is 9h and 37min.

When is the sunrise / sunset in December in Pleasanton?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:49 pm. On the last day of the month, in Pleasanton, sunrise is at 7:22 am and sunset at 4:59 pm PST.

What is the month with the least sunshine in Pleasanton?

With an average of 6h of sunshine, December has the least sunshine of the year in Pleasanton, California.

How many hours of sunshine does Pleasanton have in December?

The average sunshine duration in December in Pleasanton is 6h.

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

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

How high is the UV index in December in Pleasanton?

In December, the average daily maximum UV index in Pleasanton, California, is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Pleasanton, CA

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

The warmest month (with the highest average high temperature) is July (85.3°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 August (56.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in December
Pleasanton, CA

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in December
Pleasanton, CA

Average wind speed in December - Pleasanton, CA
  • Average wind speed in December: 4.7mph

The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).

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Average humidity in December
Pleasanton, CA

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

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (56%).

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Average rainfall in December
Pleasanton, CA

Average rainfall in December - Pleasanton, CA
  • Average rainfall in December: 1.81"

The wettest month (with the highest rainfall) is February (2.05").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Pleasanton, CA

Average rainfall days in December - Pleasanton, CA
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in December / Average sunshine in December - Pleasanton, CA
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in December
Pleasanton, CA

Average sunshine days in December - Pleasanton, CA
  • Average sunshine days in December: 19.6 days

The month with the most sunshine days is August (29 days).
The month with the least sunshine days is March (17.6 days).

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Average UV index in December
Pleasanton, CA

Average UV index in December - Pleasanton, 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
Pleasanton, CA

Average cloud cover in December - Pleasanton, CA
  • Average cloud cover in December: 34

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

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Average visibility in December
Pleasanton, CA

Average visibility in December - Pleasanton, 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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Pleasanton, California, USA

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