December weather forecast
Seal Beach, CA

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Weather in December

The first month of the winter, December, is also an enjoyable month in Seal Beach, California, with an average temperature ranging between min 53.4°F (11.9°C) and max 62.8°F (17.1°C).

Temperature

In Seal Beach, California, the month of December is known for its lowest average temperatures, reaching a high of 62.8°F (17.1°C) and a low of 53.4°F (11.9°C).

Humidity

The average relative humidity in December is 59%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.6 days and typically aggregates up to 1.77" (45mm) of precipitation.

Ocean temperature

In December, the average ocean temperature is 60.4°F (15.8°C).
Note: For swimming, a surface water temperature of 60.4°F (15.8°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

December has the shortest days of the year, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 6:39 am and sunset at 4:43 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:54 pm PST.

Sunshine

With an average of 6.7h of sunshine, December has the least sunshine of the year in Seal Beach.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 4 transforms into these recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest in Seal Beach?

With its average high temperature of 62.8°F (17.1°C) and a low of 53.4°F (11.9°C), December is regarded as the coldest month.

What is the temperature in December?

The average high-temperature and low-temperature during December are 62.8°F (17.1°C) and 53.4°F (11.9°C) respectively.

What is the average humidity in December?

In Seal Beach, the average relative humidity in December is 59%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 6.6 days and accumulates 1.77" (45mm) of precipitation.

How much does it rain in December?

In Seal Beach, during December, the rain falls for 6.6 days and regularly aggregates up to 1.77" (45mm) of precipitation.

What is the ocean temperature in December?

In December, the average ocean temperature is 60.4°F (15.8°C). For most, swimming in 60.4°F (15.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days?

With an average of 10h and 0min of daylight, December has the shortest days of the year.

How many hours of daylight does Seal Beach have in December?

The average day length in December is 9h and 58min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:39 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:54 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 6.7h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 6.7h.

When is the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4.

How high is the UV index in December?

In Seal Beach, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
Seal Beach, CA

Average temperature in December - Seal Beach, CA
  • Average high temperature in December: 62.8°F

The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (62.8°F).

  • Average low temperature in December: 53.4°F

The month with the highest average low temperature is August (65.3°F).
The coldest month (with the lowest average low temperature) is February (52.7°F).

Average pressure in December
Seal Beach, CA

Average pressure in December - Seal Beach, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).

Average wind speed in December
Seal Beach, CA

Average wind speed in December - Seal Beach, CA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.3mph).

Average humidity in December
Seal Beach, CA

Average humidity in December - Seal Beach, CA
  • Average humidity in December: 59%

The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (57%).

Average rainfall in December
Seal Beach, CA

Average rainfall in December - Seal Beach, CA
  • Average rainfall in December: 1.77"

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Seal Beach, CA

Average rainfall days in December - Seal Beach, CA
  • Average rainfall days in December: 6.6 days

The month with the highest number of rainy days is March (8.1 days).
The months with the least rainy days are June and August (2.3 days).

Average sea temperature in December
Seal Beach, CA

Average sea temperature in December - Seal Beach, CA
  • Average sea temperature in December: 60.4°F

The best months for swimming (with the highest average sea temperature) are July and August (67.9°F).
The coldest month (with the lowest average sea temperature) is January (58.3°F).

Average daylight in December /
Average sunshine in December
Seal Beach, CA

Average daylight in December / Average sunshine in December - Seal Beach, CA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 4min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

Average sunshine days in December
Seal Beach, CA

Average sunshine days in December - Seal Beach, CA
  • Average sunshine days in December: 22.7 days

The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is February (19.3 days).

Average UV index in December
Seal Beach, CA

Average UV index in December - Seal Beach, CA
  • Average UV index in December: 4

The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

Average cloud cover in December
Seal Beach, CA

Average cloud cover in December - Seal Beach, CA
  • Average cloud cover in December: 23

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

Average visibility in December
Seal Beach, CA

Average visibility in December - Seal Beach, 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).

Seal Beach, California, USA

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