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 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
The month of December, characterized by an average high of 62.6°F (17°C) and a low of 52.7°F (11.5°C), is recognized as the coldest.Humidity
The average relative humidity in December is 59%.Rainfall
The month with the most rainfall in Fountain Valley is December, when the rain falls for 7.1 days and typically aggregates up to 1.81" (46mm) of precipitation.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 6:38 am and sunset at 4:43 pm. On the last day of December, sunrise is at 6:56 am and sunset at 4:53 pm PST.
Sunshine
December has the least sunshine of the year in Fountain Valley, with an average of 6.6h of sunshine.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 reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 4 transforms into these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Fountain Valley?
What are the temperatures in Fountain Valley in December?
What is the average humidity in December in Fountain Valley?
What is the rainiest month in Fountain Valley?
How many days does it rain in December in Fountain Valley?
What is the month with the shortest days in Fountain Valley?
How many hours of daylight does Fountain Valley have in December?
When is the sunrise / sunset in December in Fountain Valley?
What is the month with the least sunshine in Fountain Valley?
How many hours of sunshine does Fountain Valley have in December?
What are the months with the lowest UV index in Fountain Valley?
What is the UV index reading in December in Fountain Valley?
Average temperature in December
Fountain Valley, CA
- Average high temperature in December: 62.6°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is December (62.6°F).
- Average low temperature in December: 52.7°F
The month with the highest average low temperature is August (65.1°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).
Average pressure in December
Fountain Valley, 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
Fountain Valley, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5.2mph).
Average humidity in December
Fountain Valley, CA
- Average humidity in December: 59%
The month with the highest relative humidity is June (72%).
The month with the lowest relative humidity is November (56%).
Average rainfall in December
Fountain Valley, CA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is December (1.81").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Fountain Valley, CA
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is March (7.9 days).
The month with the least rainy days is August (2.1 days).
Average daylight in December /
Average sunshine in December
Fountain Valley, 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 months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in December
Fountain Valley, CA
- Average sunshine days in December: 22.9 days
The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is February (20 days).
Average UV index in December
Fountain Valley, 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
Fountain Valley, CA
- Average cloud cover in December: 24
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Fountain Valley, 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).
Fountain Valley, California, USA
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