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
San Clemente's coldest month, December, registers temperatures that range from a high of 62.6°F (17°C) to a low of 50.4°F (10.2°C).Humidity
The average relative humidity in December in San Clemente is 63%.Rainfall
December is the month with the most rainfall in San Clemente. Rain falls for 4.8 days and accumulates 0.71" (18mm) of precipitation.Ocean temperature
In San Clemente, California, in December, the average water temperature is 60.4°F (15.8°C).Note: Swimming in water of 60.4°F (15.8°C) is not enjoyable for the majority of individuals. Breathing control becomes increasingly challenging as the temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:36 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:54 am and sunset at 4:53 pm PST.
Sunshine
With an average of 6.5h of sunshine, December has the least sunshine of the year.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 of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 4 during December translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What is the coldest time of year in San Clemente?
What are December temperatures in San Clemente?
What is the average humidity in December in San Clemente?
What is the rainiest month in San Clemente?
How many days does it rain in December in San Clemente?
How cold is the water in December in San Clemente?
What is the month with the shortest days in San Clemente?
What is the average length of the day in December in San Clemente?
When is the sunrise / sunset in December in San Clemente?
What is the month with the least sunshine in San Clemente?
How long on average sun shines in December in San Clemente?
What is the month with the lowest UV index in San Clemente?
What is the UV index reading in December in San Clemente?
Average temperature in December
San Clemente, CA
- Average high temperature in December: 62.6°F
The warmest month (with the highest average high temperature) is September (77.4°F).
The month with the lowest average high temperature is December (62.6°F).
- Average low temperature in December: 50.4°F
The months with the highest average low temperature are August and September (63.5°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).
Average pressure in December
San Clemente, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
San Clemente, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (4.9mph).
Average humidity in December
San Clemente, CA
- Average humidity in December: 63%
The month with the highest relative humidity is June (75%).
The month with the lowest relative humidity is November (60%).
Average rainfall in December
San Clemente, CA
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is December (0.71").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
San Clemente, CA
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.4 days).
Average sea temperature in December
San Clemente, CA
- Average sea temperature in December: 60.3°F
The best month for swimming (with the highest average sea temperature) is August (68.3°F).
The coldest months (with the lowest average sea temperature) are January and February (58.9°F).
Average daylight in December /
Average sunshine in December
San Clemente, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in December
San Clemente, CA
- Average sunshine days in December: 24.3 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in December
San Clemente, 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
San Clemente, CA
- Average cloud cover in December: 26
The months with the most cloud cover are March and May (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in December
San Clemente, 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).
San Clemente, California, USA
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