December weather forecast
Irvine, CA

The neon-lit city of Irvine in California, with highway lights and the distant hill ranges and skyscape
The neon-lit city of Irvine in California, with highway lights and the distant hill ranges and skyscape

Weather in December

December, the first month of the winter in Irvine, is still a comfortable month, with an average temperature ranging between min 51.8°F (11°C) and max 63°F (17.2°C).

Temperature

December is the coldest month, with an average high-temperature of 63°F (17.2°C) and an average low-temperature of 51.8°F (11°C).

Humidity

The average relative humidity in December is 60%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.9 days and typically aggregates up to 1.54" (39mm) of precipitation.

Daylight

With an average of 9h and 58min of daylight, December has the shortest days of the year in Irvine, California.
On the first day of the month, sunrise is at 6:37 am and sunset at 4:42 pm. On the last day of December, in Irvine, sunrise is at 6:55 am and sunset at 4:53 pm PST.

Sunshine

The month with the least sunshine in Irvine is December, with an average of 6.6h 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 estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in December transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Irvine?

December is the coldest month, with an average high-temperature of 63°F (17.2°C) and an average low-temperature of 51.8°F (11°C).

What is the average humidity in December in Irvine?

The average relative humidity in December is 60%.

What is the rainiest month in Irvine?

December is the month with the most rainfall in Irvine. Rain falls for 6.9 days and accumulates 1.54" (39mm) of precipitation.

How much does it rain in Irvine in December?

In December, in Irvine, the rain falls for 6.9 days. Throughout December, 1.54" (39mm) of precipitation is accumulated.

What is the month with the shortest days in Irvine?

With an average of 9h and 58min of daylight, December has the shortest days of the year in Irvine, California.

How many hours of daylight does Irvine have in December?

In December, the average day length in Irvine is 9h and 58min.

When are sunrise and sunset in December in Irvine?

In December, on the first day of the month, sunrise is at 6:37 am and sunset at 4:42 pm. On the last day of the month, in Irvine, sunrise is at 6:55 am and sunset at 4:53 pm PST.

What is the month with the least sunshine in Irvine?

With an average of 6.6h of sunshine, December has the least sunshine of the year in Irvine.

How long on average sun shines in December in Irvine?

In Irvine, California, the average sunshine duration in December is 6.6h.

What is the month with the lowest UV index in Irvine?

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

How high is the UV index in December in Irvine?

The average daily maximum UV index in December in Irvine is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Irvine, CA

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).

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Average pressure in December
Irvine, CA

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).

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Average wind speed in December
Irvine, CA

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).

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Average humidity in December
Irvine, CA

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%).

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Average rainfall in December
Irvine, CA

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").

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Average rainfall days in December
Irvine, CA

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).

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Average daylight in December /
Average sunshine in December
Irvine, CA

Average daylight in December / Average sunshine in December - Irvine, CA
  • Average daylight in December: 9h and 58min

The month with the longest days is June (Average daylight: 14h and 22min).
The month with the shortest days is December (Average daylight: 9h and 58min).

  • 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).

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Average sunshine days in December
Irvine, CA

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).

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Average UV index in December
Irvine, CA

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).

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Average cloud cover in December
Irvine, CA

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).

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Average visibility in December
Irvine, CA

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).

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