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December Weather in Irvine, United States

Last updated: June 24, 2025

In Irvine, United States, the average temperature in December hovers around 5°C (42°F), with a chilly minimum of -12°C (11°F) and a warm maximum of 21°C (70°F). Expect about 127 mm (5.0 in) of precipitation spread over 10 days, contributing to a notably high average humidity of 88%.

December Temperature in Irvine

In December in Irvine, the average temperature is 5°C (42°F). Maximum temperatures can reach 21°C (70°F), while the minimum can drop as low as -12°C (11°F). It's advisable to pack layers for your trip, as the temperature can vary significantly throughout the day.

December Weather in Irvine: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Irvine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Irvine, December typically has an average temperature of 5°C (42°F), with highs reaching up to 21°C (70°F) and lows dropping to around -12°C (11°F).
JanFebMarAprMayJunJulAugSepOctNovDec374248566773787671614642
Data source: Temperature data for Irvine generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Irvine

In Irvine in December, the precipitation amount is 127 mm (5.0 in), spread over a period of 10 days.

December Precipitation Trends in Irvine

The chart displays monthly precipitation patterns in Irvine, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Irvine, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9415312513412417110111511111381127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Irvine

In Irvine in December humidity is 88%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less appealing and leading you to seek warmth indoors instead.

December Average Humidity in Irvine

This chart illustrates the average monthly humidity levels in Irvine, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Irvine is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Irvine

In Irvine in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Irvine, you can check the information here.

Maximum UV Index Levels in Irvine for December

The chart shows the monthly maximum UV Index (UVI) for Irvine in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Irvine typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
Data source: Irvine December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Irvine Compares to Other Months

Weather in Irvine varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Irvine, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Irvine, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)94 mm (3.7 inches)88%moderate
February Weather5°C (42°F)153 mm (6.0 inches)88%high
March Weather9°C (49°F)125 mm (4.9 inches)87%high
April Weather13°C (57°F)134 mm (5.3 inches)84%very high
May Weather19°C (67°F)123 mm (4.9 inches)84%very high
June Weather23°C (73°F)171 mm (6.7 inches)83%extreme
July Weather25°C (78°F)100 mm (4.0 inches)79%extreme
August Weather24°C (76°F)115 mm (4.5 inches)66%very high
September Weather22°C (71°F)111 mm (4.4 inches)67%very high
October Weather16°C (61°F)113 mm (4.4 inches)76%high
November Weather8°C (46°F)80 mm (3.2 inches)89%moderate
December Weather5°C (42°F)127 mm (5.0 inches)88%moderate

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