December weather forecast
Alameda, CA

Weather in December

The first month of the winter, December, is also a moderate month in Alameda, California, with an average temperature varying between 55.9°F (13.3°C) and 45.1°F (7.3°C).

Temperature

With an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 45.1°F (7.3°C), December is the coldest month.

Humidity

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

Rainfall

In Alameda, it is raining for 10.2 days, with typically 1.02" (26mm) of accumulated precipitation. In Alameda, during the entire year, the rain falls for 67.2 days and collects up to 6.1" (155mm) of precipitation.

Ocean temperature

In Alameda, the average seawater temperature in December is 54.5°F (12.5°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:24 am and sunset at 5:00 pm PST.

Sunshine

With an average of 5.9h of sunshine, December has the least sunshine of the year in Alameda.

UV index

The months with the lowest UV index in Alameda are January, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. 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.
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FAQ

What is the coldest month in Alameda?

December is the coldest month in Alameda, California, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 45.1°F (7.3°C).

What is the average humidity in December in Alameda?

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

How many days does it rain in December in Alameda?

In December, in Alameda, California, the rain falls for 10.2 days. Throughout December, 1.02" (26mm) of precipitation is accumulated.

How cold is the water in December in Alameda?

In December, the average ocean temperature in Alameda, California, is 54.5°F (12.5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Alameda?

With an average of 9h and 36min of daylight, December has the shortest days of the year in Alameda, California.

How many hours of daylight does Alameda have in December?

The average day length in December in Alameda, California, is 9h and 36min.

What time are sunrise and sunset in December in Alameda?

On the first day of December in Alameda, California, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:00 pm PST.

What is the month with the least sunshine in Alameda?

With an average of 5.9h of sunshine, December has the least sunshine of the year in Alameda.

How many hours of sunshine does Alameda have in December?

In December, the average sunshine duration in Alameda is 5.9h.

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

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

How high is the UV index in December in Alameda?

The average daily maximum UV index in December in Alameda, California, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Alameda, CA

Average temperature in December - Alameda, CA
  • Average high temperature in December: 55.9°F

The warmest month (with the highest average high temperature) is September (75.9°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in December: 45.1°F

The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is January (45°F).

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Average pressure in December
Alameda, CA

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

The month with the highest atmospheric pressure is January (30.13"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
Alameda, CA

Average wind speed in December - Alameda, CA
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest months (with the lowest average wind speed) are October and November (5.2mph).

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Average humidity in December
Alameda, CA

Average humidity in December - Alameda, 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 (65%).

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Average rainfall in December
Alameda, CA

Average rainfall in December - Alameda, CA
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is February (1.18").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in December
Alameda, CA

Average rainfall days in December - Alameda, CA
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is March (11.4 days).
The month with the least rainy days is August (1.3 days).

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Average sea temperature in December
Alameda, CA

Average sea temperature in December - Alameda, CA
  • Average sea temperature in December: 54.5°F

The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).

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

Average daylight in December / Average sunshine in December - Alameda, CA
  • Average daylight in December: 9h and 36min

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 36min).

  • Average sunshine in December: 5h and 54min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in December
Alameda, CA

Average sunshine days in December - Alameda, CA
  • Average sunshine days in December: 19.4 days

The month with the most sunshine days is July (25.4 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in December
Alameda, CA

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

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

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Average cloud cover in December
Alameda, CA

Average cloud cover in December - Alameda, 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 9).

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Average visibility in December
Alameda, CA

Average visibility in December - Alameda, 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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