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December Weather in Susanville, United States

Last updated: June 24, 2025

In December, the average temperature in Susanville, United States hovers around -1°C (30°F). Expect chilly conditions as minima can drop to -14°C (7°F), while the maximum reaches up to 12°C (55°F). During this time, prepare for 79 mm (3.1 in) of precipitation spread across approximately 10 days, contributing to an average humidity of 86%. Stay warm and dry!

December Temperature in Susanville

In December in Susanville, the average temperature is -1°C (30°F), with maximums reaching 12°C (55°F) and minimums plummeting as low as -14°C (7°F). Travelers should prepare for cold conditions and dress warmly to fully enjoy their visit.

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

The chart illustrates December temperature patterns in Susanville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Susanville, December typically has an average temperature of -1°C (30°F), with highs reaching up to 12°C (55°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec313135445364727061493930
Data source: Temperature data for Susanville 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 Susanville

In Susanville in December, the precipitation amount is 79 mm (3.1 in) over a span of 10 days.

December Precipitation Trends in Susanville

The chart displays monthly precipitation patterns in Susanville, 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 Susanville, December typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10411292485314101020354979
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Susanville

In Susanville in December, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.

December Average Humidity in Susanville

This chart illustrates the average monthly humidity levels in Susanville, 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 Susanville is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Susanville

In Susanville 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 Susanville, you can check the information here.

Maximum UV Index Levels in Susanville for December

The chart shows the monthly maximum UV Index (UVI) for Susanville 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 Susanville typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec45810111211119743
Data source: Susanville 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 Susanville Compares to Other Months

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

This table compares monthly weather conditions in Susanville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)104 mm (4.1 inches)86%moderate
February Weather0°C (32°F)112 mm (4.4 inches)87%moderate
March Weather2°C (35°F)92 mm (3.6 inches)86%very high
April Weather6°C (44°F)48 mm (1.9 inches)83%very high
May Weather12°C (53°F)53 mm (2.1 inches)72%extreme
June Weather18°C (64°F)14 mm (0.5 inches)67%extreme
July Weather22°C (72°F)10 mm (0.4 inches)56%extreme
August Weather21°C (71°F)10 mm (0.4 inches)42%extreme
September Weather16°C (62°F)20 mm (0.8 inches)46%very high
October Weather9°C (49°F)35 mm (1.4 inches)67%high
November Weather4°C (39°F)49 mm (1.9 inches)86%moderate
December Weather-1°C (30°F)79 mm (3.1 inches)86%moderate

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