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December Weather in Mission Viejo, United States

Last updated: June 24, 2025

In December, the average temperature in Mission Viejo, United States hovers around 14°C (58°F), with a minimum dipping to 7°C (46°F) and a maximum rising to 26°C (78°F). Expect about 69 mm (2.7 in) of precipitation over approximately 5 days, accompanied by an average humidity of 71%.

December Temperature in Mission Viejo

In December in Mission Viejo, the average temperature is 14°C (58°F), with maximums reaching up to 26°C (78°F) and minimums dropping as low as 7°C (46°F). It's a great time to visit, as the mild temperatures offer a pleasant climate for outdoor activities and sightseeing.

December Weather in Mission Viejo: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Mission Viejo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mission Viejo, December typically has an average temperature of 14°C (58°F), with highs reaching up to 26°C (78°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec575758616265707170686358
Data source: Temperature data for Mission Viejo 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 Mission Viejo

In Mission Viejo in December, the total precipitation amount is 69 mm (2.7 in) spread over a duration of 5 days.

December Precipitation Trends in Mission Viejo

The chart displays monthly precipitation patterns in Mission Viejo, 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 Mission Viejo, December typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec6055542514333392269
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mission Viejo

In Mission Viejo in December humidity is 71%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making it essential for travelers to pack light, breathable clothing and stay hydrated while exploring the sights.

December Average Humidity in Mission Viejo

This chart illustrates the average monthly humidity levels in Mission Viejo, 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 Mission Viejo is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mission Viejo

In Mission Viejo in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Mission Viejo for better planning.

Maximum UV Index Levels in Mission Viejo for December

The chart shows the monthly maximum UV Index (UVI) for Mission Viejo 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 Mission Viejo typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
Data source: Mission Viejo 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 Mission Viejo Compares to Other Months

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

This table compares monthly weather conditions in Mission Viejo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (58°F)60 mm (2.3 inches)74%moderate
February Weather14°C (57°F)55 mm (2.2 inches)79%high
March Weather14°C (58°F)54 mm (2.1 inches)75%very high
April Weather16°C (61°F)25 mm (1.0 inches)70%very high
May Weather16°C (62°F)14 mm (0.5 inches)70%extreme
June Weather18°C (65°F)3 mm (0.1 inches)72%extreme
July Weather21°C (70°F)3 mm (0.1 inches)73%extreme
August Weather22°C (71°F)3 mm (0.1 inches)69%very high
September Weather21°C (70°F)3 mm (0.1 inches)68%very high
October Weather20°C (68°F)9 mm (0.4 inches)67%high
November Weather17°C (63°F)22 mm (0.8 inches)68%moderate
December Weather14°C (58°F)69 mm (2.7 inches)71%moderate

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