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December Weather in Eureka, United States

Last updated: June 24, 2025

In Eureka, United States, the average temperature for December hovers around -5°C (24°F). Be prepared for chilly extremes, as minimum temperatures can plummet to -28°C (-18°F), while the maximum may reach a mild 10°C (50°F). Expect a fair amount of precipitation, with around 76 mm (3.0 in) falling over approximately 14 days. The air is often quite damp, with an average humidity of 96%, making it feel even colder.

December Temperature in Eureka

In December in Eureka, the average temperature is -5°C (24°F). Maximum can reach 10°C (50°F) and minimum can be as low as -28°C (-18°F). Be prepared for a wide range of temperatures, making it essential to pack accordingly for your travels to Eureka.

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

The chart illustrates December temperature patterns in Eureka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Eureka, December typically has an average temperature of -5°C (24°F), with highs reaching up to 10°C (50°F) and lows dropping to around -28°C (-18°F).
JanFebMarAprMayJunJulAugSepOctNovDec201629374856646353383023
Data source: Temperature data for Eureka 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 Eureka

In Eureka in December, the precipitation amount is 76 mm (3.0 in) spread over 14 days.

December Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, 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 Eureka, December typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec517058666468243038706976
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Eureka

In Eureka in December humidity is 96%. With an average temperature of -5°C (24°F), this humidity feels like an icy blanket enveloping you, making outdoor travel challenging as the cold dampness seeps into your bones, leaving you feeling unmistakably chilled and uncomfortable.

December Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, 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 Eureka is approximately 96%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%91%88%83%80%82%71%71%85%90%96%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Eureka

In Eureka in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Eureka.

Maximum UV Index Levels in Eureka for December

The chart shows the monthly maximum UV Index (UVI) for Eureka 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 Eureka typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789997421
Data source: Eureka 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 Eureka Compares to Other Months

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

This table compares monthly weather conditions in Eureka, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)51 mm (2.0 inches)95%low
February Weather-9°C (16°F)70 mm (2.8 inches)93%moderate
March Weather-2°C (29°F)58 mm (2.3 inches)91%moderate
April Weather3°C (37°F)66 mm (2.6 inches)88%high
May Weather9°C (48°F)64 mm (2.5 inches)83%very high
June Weather13°C (56°F)68 mm (2.7 inches)80%very high
July Weather18°C (64°F)23 mm (0.9 inches)82%very high
August Weather17°C (63°F)29 mm (1.2 inches)71%very high
September Weather11°C (53°F)38 mm (1.5 inches)71%high
October Weather3°C (38°F)70 mm (2.7 inches)85%moderate
November Weather-1°C (31°F)69 mm (2.7 inches)90%low
December Weather-5°C (24°F)76 mm (3.0 inches)96%low

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