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December Weather in Catalina, United States

Last updated: June 24, 2025

In December, the average temperature in Catalina, United States hovers around 11°C (52°F), with a minimum that can dip to -2°C (28°F) and a maximum soaring to 25°C (78°F). Expect 31 mm (1.2 in) of precipitation over approximately 4 days, contributing to a notably high average humidity of 82%.

December Temperature in Catalina

In December in Catalina, the average temperature is 11°C (52°F), with maximums reaching 25°C (78°F) and minimums dropping to as low as -2°C (28°F). This diverse range in temperatures makes it essential for travelers to pack accordingly, ensuring comfort during both warm and cooler moments of the day.

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

The chart illustrates December temperature patterns in Catalina, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Catalina, December typically has an average temperature of 11°C (52°F), with highs reaching up to 25°C (78°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec515360697686868581716252
Data source: Temperature data for Catalina 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 Catalina

In Catalina in December, the total precipitation amount is 31 mm (1.2 in) over a span of 4 days.

December Precipitation Trends in Catalina

The chart displays monthly precipitation patterns in Catalina, 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 Catalina, December typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec344222359966334122131
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Catalina

In Catalina in December, humidity is 82%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers and stay prepared for the moisture-laden air as you explore your surroundings.

December Average Humidity in Catalina

This chart illustrates the average monthly humidity levels in Catalina, 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 Catalina is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Catalina

In Catalina 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 Catalina for better planning.

Maximum UV Index Levels in Catalina for December

The chart shows the monthly maximum UV Index (UVI) for Catalina 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 Catalina typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121111864
Data source: Catalina 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 Catalina Compares to Other Months

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

This table compares monthly weather conditions in Catalina, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)34 mm (1.3 inches)76%moderate
February Weather12°C (53°F)42 mm (1.7 inches)79%high
March Weather15°C (60°F)22 mm (0.9 inches)67%very high
April Weather21°C (69°F)3 mm (0.1 inches)55%extreme
May Weather24°C (76°F)5 mm (0.2 inches)40%extreme
June Weather30°C (86°F)9 mm (0.3 inches)33%extreme
July Weather30°C (86°F)96 mm (3.8 inches)34%extreme
August Weather29°C (85°F)63 mm (2.5 inches)48%extreme
September Weather27°C (81°F)34 mm (1.3 inches)64%extreme
October Weather22°C (71°F)12 mm (0.5 inches)67%very high
November Weather17°C (62°F)21 mm (0.8 inches)77%high
December Weather11°C (52°F)31 mm (1.2 inches)82%moderate

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