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December Weather in Yreka, United States

Last updated: June 24, 2025

In Yreka, United States, the average temperature in December hovers around 2°C (35°F). Temperatures can dip as low as -9°C (17°F) and rise to a maximum of 15°C (59°F). Throughout the month, expect about 92 mm (3.6 in) of precipitation over 11 days, accompanied by an average humidity of 86%. Stay prepared for a brisk and damp December!

December Temperature in Yreka

In December in Yreka, the average temperature is 2°C (35°F). Maximums can reach 15°C (59°F), while minimums can drop as low as -9°C (17°F). Travelers should be prepared for chilly weather and dress in layers to enjoy their visit comfortably.

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

The chart illustrates December temperature patterns in Yreka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yreka, December typically has an average temperature of 2°C (35°F), with highs reaching up to 15°C (59°F) and lows dropping to around -9°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec363741475564727062504035
Data source: Temperature data for Yreka 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 Yreka

In Yreka in December, the precipitation amount is 92 mm (3.6 in) spread over 11 days.

December Precipitation Trends in Yreka

The chart displays monthly precipitation patterns in Yreka, 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 Yreka, December typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec121118916149165520387292
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Yreka

In Yreka in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.

December Average Humidity in Yreka

This chart illustrates the average monthly humidity levels in Yreka, 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 Yreka is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Yreka

In Yreka 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 Yreka, you can check the information here.

Maximum UV Index Levels in Yreka for December

The chart shows the monthly maximum UV Index (UVI) for Yreka 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 Yreka typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
Data source: Yreka 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 Yreka Compares to Other Months

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

This table compares monthly weather conditions in Yreka, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)121 mm (4.8 inches)86%moderate
February Weather3°C (37°F)118 mm (4.7 inches)85%moderate
March Weather5°C (42°F)91 mm (3.6 inches)85%high
April Weather9°C (48°F)61 mm (2.4 inches)82%very high
May Weather13°C (55°F)49 mm (1.9 inches)81%extreme
June Weather18°C (64°F)16 mm (0.6 inches)79%extreme
July Weather22°C (72°F)5 mm (0.2 inches)70%extreme
August Weather21°C (71°F)5 mm (0.2 inches)60%very high
September Weather17°C (62°F)20 mm (0.8 inches)62%very high
October Weather10°C (51°F)38 mm (1.5 inches)72%high
November Weather5°C (41°F)72 mm (2.8 inches)87%moderate
December Weather2°C (35°F)92 mm (3.6 inches)86%moderate

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