Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December tends to be the coldest month, with temperatures averaging a daily high of 62.8°F (17.1°C) and a low of 53.4°F (11.9°C).Humidity
In Seal Beach, the average relative humidity in December is 59%.Rainfall
December is the month with the most rainfall. Rain falls for 6.6 days and accumulates 1.77" (45mm) of precipitation.Ocean temperature
In Seal Beach, in December, the average water temperature is 60.4°F (15.8°C).Note: In 60.4°F (15.8°C), swimming is not an enjoyable activity for most. The challenge of managing one's breathing increases as the temperature goes under 69.8°F (21°C).
Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.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
December has the least sunshine of the year in Seal Beach, California, with an average of 6.7h of sunshine.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the average maximum UV index of 4 translates into the following recommendations:
Take precautions - Protection against sun damage is advised. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What month is the coldest in Seal Beach?
What is the temperature in December in Seal Beach?
What is the average humidity in December in Seal Beach?
What is the wettest month in Seal Beach?
How much does it rain in Seal Beach in December?
How cold is the water in December in Seal Beach?
What is the month with the shortest days in Seal Beach?
How many hours of daylight does Seal Beach have in December?
When are sunrise and sunset in December in Seal Beach?
What is the month with the least sunshine in Seal Beach?
How long on average sun shines in December in Seal Beach?
What are the months with the lowest UV index in Seal Beach?
What is the UV index intensity in December in Seal Beach?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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