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December Weather in Arlington, United States

Last updated: June 24, 2025

In Arlington, United States, the average temperature in December hovers around -2°C (29°F), with the mercury dipping as low as -22°C (-8°F) during the colder days and peaking at a mild 18°C (65°F). Expect 44 mm (1.7 in) of precipitation spread over approximately 6 days, contributing to an average humidity level of 81%. Stay prepared for a mix of chill and moisture this month!

December Temperature in Arlington

In December in Arlington, the average temperature is -2°C (29°F). Maximum temperatures can reach up to 18°C (65°F), while minimums can drop as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December temperature patterns in Arlington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arlington, December typically has an average temperature of -2°C (29°F), with highs reaching up to 18°C (65°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec212235455970747164513628
Data source: Temperature data for Arlington 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 Arlington

In Arlington in December, the total precipitation amount is 44 mm (1.7 in) spread over 6 days.

December Precipitation Trends in Arlington

The chart displays monthly precipitation patterns in Arlington, 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 Arlington, December typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec49545894131116921081131184444
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Arlington

In Arlington in December humidity is 81%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm while traveling.

December Average Humidity in Arlington

This chart illustrates the average monthly humidity levels in Arlington, 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 Arlington is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Arlington

In Arlington 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 Arlington, you can visit Hourly UV Index in Arlington.

Maximum UV Index Levels in Arlington for December

The chart shows the monthly maximum UV Index (UVI) for Arlington 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 Arlington typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
Data source: Arlington 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 Arlington Compares to Other Months

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

This table compares monthly weather conditions in Arlington, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)49 mm (1.9 inches)85%moderate
February Weather-6°C (22°F)54 mm (2.1 inches)85%moderate
March Weather2°C (36°F)57 mm (2.3 inches)85%moderate
April Weather7°C (46°F)94 mm (3.7 inches)85%very high
May Weather15°C (59°F)131 mm (5.2 inches)78%very high
June Weather21°C (70°F)116 mm (4.6 inches)80%very high
July Weather23°C (74°F)92 mm (3.6 inches)78%very high
August Weather22°C (71°F)108 mm (4.3 inches)76%very high
September Weather18°C (65°F)113 mm (4.4 inches)79%very high
October Weather10°C (51°F)118 mm (4.6 inches)83%moderate
November Weather2°C (36°F)43 mm (1.7 inches)88%moderate
December Weather-2°C (29°F)44 mm (1.7 inches)81%low

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