December weather forecast
Livermore, CA

A path in the scenic hilly and forest landscape of the famous Lake Del Valle Regional Park in Livermore, California
A path in the scenic hilly and forest landscape of the famous Lake Del Valle Regional Park in Livermore, California

Weather in December

The first month of the winter, December, is still a cool month in Livermore, California, with an average temperature fluctuating between 54.9°F (12.7°C) and 41.5°F (5.3°C).

Temperature

The coldest month is December, with an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 41.5°F (5.3°C).

Humidity

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

Rainfall

In December, the rain falls for 9.9 days. Throughout December, 1.85" (47mm) of precipitation is accumulated. Throughout the year, in Livermore, there are 70.6 rainfall days, and 11.3" (287mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year in Livermore, California, with an average of 9h and 37min of daylight.
On the first day of December, sunrise is at 7:03 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:58 pm PST.

Sunshine

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

UV index

The months with the lowest UV index in Livermore are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
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. 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 Livermore?

With an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 41.5°F (5.3°C), December is the coldest month.

What is the temperature in December in Livermore?

In December, in Livermore, California, the average high-temperature is 54.9°F (12.7°C), and the average low-temperature is 41.5°F (5.3°C). in September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is calculated to be 84.2°F (29°C).

What is the average humidity in December in Livermore?

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

How much does it rain in Livermore in December?

In December, in Livermore, the rain falls for 9.9 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

What is the month with the shortest days in Livermore?

With an average of 9h and 37min of daylight, December has the shortest days of the year.

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

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

What time are sunrise and sunset in December in Livermore?

On the first day of December in Livermore, sunrise is at 7:03 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:58 pm PST.

What is the month with the least sunshine in Livermore?

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

How long on average sun shines in December in Livermore?

The average sunshine duration in December in Livermore, California, is 6h.

When is the lowest UV index in Livermore?

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

How high is the UV index in December in Livermore?

In December, the average daily maximum UV index in Livermore, California, is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to 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
Livermore, CA

Average temperature in December - Livermore, CA
  • Average high temperature in December: 54.9°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (54.9°F).

  • Average low temperature in December: 41.5°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 (41.4°F).

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Average pressure in December
Livermore, CA

Average pressure in December - Livermore, 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
Livermore, CA

Average wind speed in December - Livermore, CA
  • Average wind speed in December: 4.6mph

The windiest months (with the highest average wind speed) are May and June (6.5mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).

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Average humidity in December
Livermore, CA

Average humidity in December - Livermore, 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 (55%).

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Average rainfall in December
Livermore, CA

Average rainfall in December - Livermore, CA
  • Average rainfall in December: 1.85"

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

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Average rainfall days in December
Livermore, CA

Average rainfall days in December - Livermore, CA
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is March (12.7 days).
The month with the least rainy days is August (1.3 days).

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

Average daylight in December / Average sunshine in December - Livermore, CA
  • Average daylight in December: 9h and 37min

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 37min).

  • 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
Livermore, CA

Average sunshine days in December - Livermore, CA
  • Average sunshine days in December: 20 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (17.6 days).

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Average UV index in December
Livermore, CA

Average UV index in December - Livermore, 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
Livermore, CA

Average cloud cover in December - Livermore, 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
Livermore, CA

Average visibility in December - Livermore, 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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