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December Weather in Eureka, United States

Last updated: June 24, 2025

In Eureka, United States during the month of December, the average temperature hovers around -3°C (26°F). Temperatures can dip as low as -22°C (-8°F), while the maximum can reach a comfortable 13°C (56°F). Expect about 29 mm (1.1 in) of precipitation spread across 7 days, accompanied by an average humidity of 83%.

December Temperature in Eureka

In December in Eureka, the average temperature is -3°C (26°F), with maximums reaching 13°C (56°F) and minimums plummeting to as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure their comfort during their stay.

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 -3°C (26°F), with highs reaching up to 13°C (56°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec252734465468767564483926
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 29 mm (1.1 in) over a span of 7 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 29 mm (1.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec29295739391016912222229
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 83%. With an average temperature of -3°C (26°F), this humidity feels like a heavy blanket of cold air enveloping you, making it challenging to stay warm while traveling. The dampness seeps into your clothing, creating an uncomfortable chill that lingers even indoors, often requiring extra layers and careful planning for outdoor activities.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%87%80%71%55%51%41%32%41%61%79%83%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Eureka for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46991112121110754
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-4°C (25°F)29 mm (1.1 inches)84%moderate
February Weather-3°C (27°F)29 mm (1.1 inches)87%high
March Weather1°C (35°F)57 mm (2.3 inches)80%very high
April Weather8°C (46°F)39 mm (1.5 inches)71%very high
May Weather12°C (55°F)39 mm (1.5 inches)55%extreme
June Weather20°C (68°F)10 mm (0.4 inches)51%extreme
July Weather25°C (77°F)16 mm (0.6 inches)41%extreme
August Weather24°C (75°F)9 mm (0.3 inches)32%extreme
September Weather18°C (65°F)12 mm (0.5 inches)41%very high
October Weather9°C (48°F)22 mm (0.9 inches)61%high
November Weather4°C (39°F)22 mm (0.8 inches)79%moderate
December Weather-3°C (26°F)29 mm (1.1 inches)83%moderate

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