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December Weather in Fairfax Station, United States

Last updated: June 24, 2025

In Fairfax Station, United States, the average temperature in December hovers around 5°C (42°F). Expect a chilling minimum of -10°C (14°F) and a pleasant maximum of 20°C (68°F). During this period, precipitation averages 91 mm (3.6 in) over about 9 days, while the air feels quite humid with an average of 84% humidity.

December Temperature in Fairfax Station

In December in Fairfax Station, the average temperature is 5°C (42°F). Maximums can reach 20°C (68°F) while minimums can drop as low as -10°C (14°F). Be prepared for a range of temperatures, making it essential to pack layers for your travels.

December Weather in Fairfax Station: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fairfax Station, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfax Station, December typically has an average temperature of 5°C (42°F), with highs reaching up to 20°C (68°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec374147576775817872634841
Data source: Temperature data for Fairfax Station 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 Fairfax Station

In Fairfax Station in December, the precipitation amount is 91 mm (3.6 in) spread over 9 days.

December Precipitation Trends in Fairfax Station

The chart displays monthly precipitation patterns in Fairfax Station, 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 Fairfax Station, December typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec619681102125109119152961078191
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fairfax Station

In Fairfax Station in December, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.

December Average Humidity in Fairfax Station

This chart illustrates the average monthly humidity levels in Fairfax Station, 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 Fairfax Station is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fairfax Station

In Fairfax Station 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 Fairfax Station, you can check the information here.

Maximum UV Index Levels in Fairfax Station for December

The chart shows the monthly maximum UV Index (UVI) for Fairfax Station 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 Fairfax Station typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Fairfax Station 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 Fairfax Station Compares to Other Months

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

This table compares monthly weather conditions in Fairfax Station, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)61 mm (2.4 inches)84%moderate
February Weather5°C (42°F)96 mm (3.8 inches)83%moderate
March Weather8°C (47°F)81 mm (3.2 inches)83%high
April Weather14°C (57°F)102 mm (4.0 inches)81%very high
May Weather19°C (67°F)125 mm (4.9 inches)78%very high
June Weather24°C (76°F)109 mm (4.3 inches)79%very high
July Weather27°C (81°F)119 mm (4.7 inches)74%very high
August Weather25°C (78°F)152 mm (6.0 inches)72%very high
September Weather22°C (72°F)96 mm (3.8 inches)75%very high
October Weather17°C (63°F)107 mm (4.2 inches)81%high
November Weather9°C (48°F)81 mm (3.2 inches)85%moderate
December Weather5°C (42°F)91 mm (3.6 inches)84%moderate

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