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December Weather in Alturas, United States

Last updated: June 24, 2025

The average temperature in Alturas, United States during December is a pleasant 18°C (66°F). Expect a minimum of 3°C (37°F) and a maximum soaring to 31°C (88°F). Rainfall is moderate, with an average precipitation of 55 mm (2.2 in) spread across 6 days. With an average humidity of 84%, be prepared for a warm and somewhat humid experience!

December Temperature in Alturas

In December in Alturas, the average temperature is 18°C (66°F). Maximum can reach 31°C (88°F) and minimum can be as low as 3°C (37°F). It's an ideal time for travelers to enjoy pleasant weather while exploring the attractions of Alturas.

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

The chart illustrates December temperature patterns in Alturas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alturas, December typically has an average temperature of 18°C (66°F), with highs reaching up to 31°C (88°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec626870757981818281787065
Data source: Temperature data for Alturas 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 Alturas

In Alturas in December, the total precipitation amount is 55 mm (2.2 in) spread over 6 days.

December Precipitation Trends in Alturas

The chart displays monthly precipitation patterns in Alturas, 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 Alturas, December typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec36491768135236265260197744555
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Alturas

In Alturas in December humidity is 84%. With an average temperature of 18°C (66°F), this humidity feels like a warm wrap around your skin, making even short excursions feel heavy and sticky, requiring frequent breaks for hydration and relief from the muggy atmosphere.

December Average Humidity in Alturas

This chart illustrates the average monthly humidity levels in Alturas, 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 Alturas is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Alturas

In Alturas 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 Alturas.

Maximum UV Index Levels in Alturas for December

The chart shows the monthly maximum UV Index (UVI) for Alturas 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 Alturas typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111212121211975
Data source: Alturas 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 Alturas Compares to Other Months

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

This table compares monthly weather conditions in Alturas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)36 mm (1.4 inches)83%high
February Weather20°C (69°F)49 mm (1.9 inches)80%very high
March Weather21°C (70°F)17 mm (0.7 inches)75%very high
April Weather24°C (75°F)68 mm (2.7 inches)68%extreme
May Weather26°C (79°F)135 mm (5.3 inches)65%extreme
June Weather27°C (81°F)236 mm (9.3 inches)73%extreme
July Weather27°C (82°F)265 mm (10.4 inches)77%extreme
August Weather28°C (82°F)260 mm (10.2 inches)80%extreme
September Weather27°C (81°F)197 mm (7.7 inches)83%extreme
October Weather26°C (78°F)74 mm (2.9 inches)83%very high
November Weather21°C (70°F)45 mm (1.8 inches)83%high
December Weather18°C (66°F)55 mm (2.2 inches)84%moderate

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