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December Weather in San Manuel, United States

Last updated: June 24, 2025

In December, the average temperature in San Manuel, United States hovers around 9°C (49°F). Expect a minimum chill of -6°C (21°F) and a pleasant maximum of 24°C (75°F). This month also sees 43 mm (1.7 in) of precipitation spread over 6 days, contributing to a cozy average humidity of 82%. Prepare accordingly for a mix of cool and warm weather!

December Temperature in San Manuel

In December in San Manuel, the average temperature is 9°C (49°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop as low as -6°C (21°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly!

December Weather in San Manuel: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Manuel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Manuel, December typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec485056667283828077675949
Data source: Temperature data for San Manuel 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 San Manuel

In San Manuel in December, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

December Precipitation Trends in San Manuel

The chart displays monthly precipitation patterns in San Manuel, 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 San Manuel, December typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec43553158141129243212443
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Manuel

In San Manuel in December, humidity is 82%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and prompting travelers to seek warmth indoors or in cozy cafes.

December Average Humidity in San Manuel

This chart illustrates the average monthly humidity levels in San Manuel, 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 San Manuel 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 San Manuel

In San Manuel in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in San Manuel.

Maximum UV Index Levels in San Manuel for December

The chart shows the monthly maximum UV Index (UVI) for San Manuel 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 San Manuel typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710111213121111865
Data source: San Manuel 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 San Manuel Compares to Other Months

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

This table compares monthly weather conditions in San Manuel, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)43 mm (1.7 inches)76%moderate
February Weather10°C (50°F)55 mm (2.2 inches)79%high
March Weather13°C (56°F)31 mm (1.2 inches)67%very high
April Weather19°C (66°F)5 mm (0.2 inches)55%extreme
May Weather22°C (73°F)8 mm (0.3 inches)40%extreme
June Weather28°C (83°F)14 mm (0.6 inches)33%extreme
July Weather28°C (82°F)112 mm (4.4 inches)34%extreme
August Weather27°C (81°F)92 mm (3.6 inches)48%extreme
September Weather25°C (77°F)43 mm (1.7 inches)64%extreme
October Weather20°C (68°F)21 mm (0.8 inches)67%very high
November Weather15°C (59°F)24 mm (0.9 inches)77%high
December Weather9°C (49°F)43 mm (1.7 inches)82%moderate

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