December weather forecastIrvine, CA
December
Weather in December
Ending the cycle of seasons in Irvine, December is synonymous with cooler temperatures and the holiday season. Despite the drop in temperatures, the conditions remain relatively mild compared to other regions of the country. December brings the highest amount of rainfall for the year, with an average precipitation of 1.54" (39mm). Irvine's Christmas festivities and New Year’s celebrations fill the city with a sense of warmth and merriment. The city bids adieu to the year amidst twinkling lights, cozy fireplaces, holiday markets, and a blanket of tranquillity.Temperature
Irvine's temperature records reveal December as the coldest month, marked by average highs of 63°F (17.2°C) and lows of 51.8°F (11°C).Humidity
In Irvine, the average relative humidity in December is 60%.Rainfall
December is the month with the most rainfall. Rain falls for 6.9 days and accumulates 1.54" (39mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 6:38 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:53 pm PST.
Sunshine
The month with the least sunshine is December, 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 value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 4 in December transforms into the following instructions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Irvine, CA
- Average high temperature in December: 63°F
The warmest month (with the highest average high temperature) is August (79.9°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in December: 51.8°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).
Average pressure in December
Irvine, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Irvine, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (4.8mph).
Average humidity in December
Irvine, CA
- Average humidity in December: 60%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (56%).
Average rainfall in December
Irvine, CA
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Irvine, CA
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is March (7.9 days).
The month with the least rainy days is June (2.2 days).
Average daylight in December /
Average sunshine in December
Irvine, 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 36min
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
Irvine, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is May (19.7 days).
Average UV index in December
Irvine, CA
- Average UV index in December: 4
The months with the highest UV index are June, 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
Irvine, CA
- Average cloud cover in December: 24
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Irvine, 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).
