Irvine
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Irvine, CA

A unique sunrise sky view over the neon-lit city of Irvine in California, with highway lights, and the distant hill ranges and skyscape
A unique sunrise sky view over the neon-lit city of Irvine in California, with highway lights, and the distant hill ranges and skyscape
The first month of the winter, December, is also an enjoyable month in Irvine, California, with average temperature ranging between min 51.8°F (11°C) and max 63°F (17.2°C).

Temperature

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

Humidity

In Irvine, the average relative humidity 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

The month with the shortest days in Irvine is December, with an average of 9.9h of daylight.

Sunshine

December has the least sunshine of the year in Irvine, 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 in Irvine. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in December interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the coldest month in Irvine?

The coldest month is December, 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 temperature in December in Irvine?

In December, the average high-temperature is 63°F (17.2°C), and the average low-temperature is 51.8°F (11°C).

What is the average humidity in December in Irvine?

In December, the average relative humidity in Irvine is 60%.

How many days does it rain in December in Irvine?

In Irvine, during December, the rain falls for 6.9 days and regularly aggregates up to 1.54" (39mm) of precipitation.

What is the wettest month in Irvine?

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.

What is the month with the shortest days in Irvine?

The month with the shortest days in Irvine is December, with an average of 9.9h of daylight.

What is the average length of the day in December in Irvine?

In Irvine, the average length of the day in December is 9.9h.

What is the month with the least sunshine in Irvine?

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

How many hours of sunshine does Irvine have in December?

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

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

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

What is the UV index intensity in December in Irvine?

The average daily maximum UV index in December in Irvine, California, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.
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 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 lowest 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 lowest number of rainy days is June (2.2 days).

Average daylight in December / Average sunshine in December - Irvine, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.6h

Months with most sunshine are July and August (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 6.6h).

Average UV index in December - Irvine, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).