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December Weather in Calwa, United States

Last updated: June 24, 2025

In December, the average temperature in Calwa, United States hovers around 10°C (50°F). During this month, you can expect a minimum temperature of -2°C (30°F) and a maximum of 24°C (76°F). With an average precipitation of 69 mm (2.7 in) spread over 7 days, and an average humidity of 79%, it’s a month that blends cool weather with occasional showers, perfect for cozy indoor activities or exploring the vibrant outdoors!

December Temperature in Calwa

In December in Calwa, the average temperature is 10°C (50°F). Maximums can reach 24°C (76°F), while minimums can drop as low as -2°C (30°F). This range makes Calwa a versatile destination for travelers, offering opportunities for both warm and cooler weather activities.

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

The chart illustrates December temperature patterns in Calwa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Calwa, December typically has an average temperature of 10°C (50°F), with highs reaching up to 24°C (76°F) and lows dropping to around -2°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec505257647281888679675749
Data source: Temperature data for Calwa 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 Calwa

In Calwa in December, the precipitation amount is 69 mm (2.7 in) over the course of 7 days.

December Precipitation Trends in Calwa

The chart displays monthly precipitation patterns in Calwa, 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 Calwa, December typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec87739338231001143969
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Calwa

In Calwa in December humidity is 79%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less inviting and requiring layered clothing to stay comfortable while traveling.

December Average Humidity in Calwa

This chart illustrates the average monthly humidity levels in Calwa, 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 Calwa is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%85%80%72%58%49%36%30%42%59%78%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Calwa

In Calwa 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 Calwa, you can check the information here.

Maximum UV Index Levels in Calwa for December

The chart shows the monthly maximum UV Index (UVI) for Calwa 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 Calwa typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Calwa 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 Calwa Compares to Other Months

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

This table compares monthly weather conditions in Calwa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)87 mm (3.4 inches)82%moderate
February Weather11°C (53°F)73 mm (2.9 inches)85%moderate
March Weather14°C (57°F)93 mm (3.6 inches)80%very high
April Weather18°C (65°F)38 mm (1.5 inches)72%very high
May Weather22°C (72°F)23 mm (0.9 inches)58%very high
June Weather27°C (82°F)1 mm (0.0 inches)49%extreme
July Weather31°C (88°F)0 mm (0.0 inches)36%extreme
August Weather30°C (86°F)0 mm (0.0 inches)30%very high
September Weather26°C (79°F)1 mm (0.0 inches)42%very high
October Weather20°C (67°F)14 mm (0.6 inches)59%high
November Weather14°C (57°F)39 mm (1.5 inches)78%moderate
December Weather10°C (50°F)69 mm (2.7 inches)79%moderate

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