December Weather in Santa Ana, United States

Last updated: June 24, 2025

In December, the average temperature in Santa Ana, United States hovers around 13°C (56°F), making it a pleasant time to explore. Expect temperatures to range from a cool 4°C (39°F) to a warm 28°C (82°F). During this month, you may encounter 74 mm (2.9 in) of precipitation spread over about 5 days, contributing to an average humidity of 71%. Be prepared for a mix of sunshine and occasional showers!

December Temperature in Santa Ana

In December in Santa Ana, the average temperature is 13°C (56°F). The maximum can reach 28°C (82°F), while the minimum can drop as low as 4°C (39°F). This makes Santa Ana an ideal destination for travelers seeking mild weather with a pleasant range of temperatures.

December Weather in Santa Ana: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santa Ana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Ana, December typically has an average temperature of 13°C (56°F), with highs reaching up to 28°C (82°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec565658626368737472686256
Data source: Temperature data for Santa Ana 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 Santa Ana

In Santa Ana in December, the total precipitation amount is 74 mm (2.9 in) over a span of 5 days.

December Precipitation Trends in Santa Ana

The chart displays monthly precipitation patterns in Santa Ana, 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 Santa Ana, December typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec71606827131223102574
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santa Ana

In Santa Ana in December humidity is 71%. With an average temperature of 13°C (56°F), this humidity feels like a damp embrace that can make exploring the area feel a bit stifling and requires light, breathable clothing to remain comfortable while traveling.

December Average Humidity in Santa Ana

This chart illustrates the average monthly humidity levels in Santa Ana, 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 Santa Ana 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 Santa Ana

In Santa Ana 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 Santa Ana for better planning.

Maximum UV Index Levels in Santa Ana for December

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

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

This table compares monthly weather conditions in Santa Ana, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)71 mm (2.8 inches)74%moderate
February Weather13°C (56°F)60 mm (2.3 inches)79%high
March Weather14°C (58°F)68 mm (2.7 inches)75%very high
April Weather17°C (62°F)27 mm (1.1 inches)70%very high
May Weather17°C (64°F)13 mm (0.5 inches)70%extreme
June Weather20°C (68°F)1 mm (0.0 inches)72%extreme
July Weather23°C (73°F)2 mm (0.1 inches)73%extreme
August Weather23°C (74°F)2 mm (0.1 inches)69%very high
September Weather22°C (72°F)3 mm (0.1 inches)68%very high
October Weather20°C (69°F)10 mm (0.4 inches)67%high
November Weather17°C (62°F)25 mm (1.0 inches)68%moderate
December Weather13°C (56°F)74 mm (2.9 inches)71%moderate

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