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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 11°C (52°F). Be prepared for a range of temperatures, with lows dipping to -5°C (24°F) and highs soaring up to 29°C (84°F). Expect 57 mm (2.3 in) of precipitation spread across 7 days, while the average humidity rests at a high 87%.

December Temperature in Arlington

In December in Arlington, the average temperature is 11°C (52°F), with maximums reaching up to 29°C (84°F) and minimums dropping as low as -5°C (24°F). This range of temperatures means travelers should be prepared for both warm days and chilly nights during their visit.

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 11°C (52°F), with highs reaching up to 29°C (84°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec474961667582858579685752
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 precipitation amount is 58 mm (2.3 in) over the course of 7 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 58 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec5594107106158914495761435558
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 87%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make your clothes cling uncomfortably, leaving you feeling slightly weighed down while exploring the area.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
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 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 Arlington for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
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 Weather8°C (47°F)55 mm (2.2 inches)80%moderate
February Weather10°C (50°F)94 mm (3.7 inches)79%high
March Weather16°C (61°F)107 mm (4.2 inches)78%very high
April Weather19°C (66°F)106 mm (4.2 inches)78%very high
May Weather24°C (75°F)158 mm (6.2 inches)81%extreme
June Weather28°C (82°F)91 mm (3.6 inches)78%extreme
July Weather30°C (86°F)44 mm (1.7 inches)73%extreme
August Weather29°C (85°F)95 mm (3.7 inches)66%extreme
September Weather26°C (80°F)76 mm (3.0 inches)65%very high
October Weather20°C (68°F)143 mm (5.6 inches)72%very high
November Weather14°C (57°F)55 mm (2.2 inches)82%high
December Weather11°C (52°F)58 mm (2.3 inches)87%moderate

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