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December Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in December hovers around 0°C (33°F), with a minimum dipping to -17°C (2°F) and a maximum reaching 16°C (62°F). Expect about 78 mm (3.1 in) of precipitation spread over 13 days, contributing to a high average humidity of 90%. Stay warm and prepared for wet weather!

December Temperature in Fairfield

In December in Fairfield, the average temperature is 0°C (33°F), with a maximum that can reach 16°C (62°F) and a minimum that can drop as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both cold and mild conditions.

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

The chart illustrates December temperature patterns in Fairfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfield, December typically has an average temperature of 0°C (33°F), with highs reaching up to 16°C (62°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec323140475765747362483932
Data source: Temperature data for Fairfield 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 Fairfield

In Fairfield in December, the precipitation amount is 78 mm (3.1 in) spread over 13 days.

December Precipitation Trends in Fairfield

The chart displays monthly precipitation patterns in Fairfield, 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 Fairfield, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec7675635753243932618978
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fairfield

In Fairfield in December humidity is 90%. With average temperature 0°C (33°F) this humidity feels like a damp chill that clings to your skin, making every step outside feel heavier and more exhausting for traveling.

December Average Humidity in Fairfield

This chart illustrates the average monthly humidity levels in Fairfield, 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 Fairfield is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fairfield

In Fairfield in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Fairfield, you can visit Hourly UV Index in Fairfield.

Maximum UV Index Levels in Fairfield for December

The chart shows the monthly maximum UV Index (UVI) for Fairfield 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 Fairfield typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Fairfield 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 Fairfield Compares to Other Months

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

This table compares monthly weather conditions in Fairfield, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)76 mm (3.0 inches)89%low
February Weather-1°C (31°F)75 mm (3.0 inches)89%moderate
March Weather4°C (40°F)63 mm (2.5 inches)87%moderate
April Weather8°C (47°F)57 mm (2.2 inches)84%high
May Weather14°C (57°F)53 mm (2.1 inches)77%very high
June Weather19°C (66°F)24 mm (1.0 inches)78%very high
July Weather23°C (74°F)3 mm (0.1 inches)77%very high
August Weather23°C (73°F)9 mm (0.3 inches)64%very high
September Weather17°C (62°F)32 mm (1.2 inches)62%high
October Weather9°C (48°F)61 mm (2.4 inches)79%moderate
November Weather4°C (39°F)89 mm (3.5 inches)87%moderate
December Weather0°C (33°F)78 mm (3.1 inches)90%low

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