January Weather in Arlington, United States

Last updated: June 24, 2025

In January, the average temperature in Arlington, United States hovers around -5°C (23°F). While the mercury can plummet to a chilling -29°C (-20°F), it may also rise to a comfortable 16°C (61°F). Expect 83 mm (3.3 in) of precipitation spread over 11 days, paired with an average humidity of a brisk 89%. Stay prepared for a mix of wintery weather!

January Temperature in Arlington

In January in Arlington, the average temperature is -5°C (23°F) with maximums reaching 16°C (61°F) and minimums dropping as low as -29°C (-20°F). Be sure to pack warm clothing for your travels during this time, as temperatures can vary significantly.

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

The chart illustrates January 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, January typically has an average temperature of -5°C (23°F), with highs reaching up to 16°C (61°F) and lows dropping to around -29°C (-20°F).

Data source: Temperature data for Arlington generated using information from the Copernicus Climate Change Service.

January Precipitation in Arlington

In Arlington in January, the precipitation amount is 83 mm (3.3 in) over the course of 11 days.

January Precipitation Trends in Arlington

The chart displays monthly precipitation patterns in Arlington, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Arlington, January typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Arlington

In Arlington in January, humidity is 89%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and prompting frequent breaks to warm up indoors.

January Average Humidity in Arlington

This chart illustrates the average monthly humidity levels in Arlington, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Arlington is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Arlington

In Arlington in January, 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 Arlington, you can check the information here.

Maximum UV Index Levels in Arlington for January

The chart shows the monthly maximum UV Index (UVI) for Arlington in January, 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 January, the maximum UV index in Arlington typically reaches 3, which falls under the moderate exposure category.

Data source: Arlington January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	83 mm (3.3 inches)	89%	moderate
February Weather	-3°C (26°F)	100 mm (3.9 inches)	88%	moderate
March Weather	0°C (32°F)	88 mm (3.5 inches)	86%	high
April Weather	7°C (45°F)	131 mm (5.2 inches)	84%	very high
May Weather	14°C (57°F)	102 mm (4.0 inches)	76%	very high
June Weather	19°C (66°F)	87 mm (3.4 inches)	72%	very high
July Weather	22°C (71°F)	120 mm (4.7 inches)	66%	very high
August Weather	21°C (69°F)	93 mm (3.7 inches)	64%	very high
September Weather	17°C (62°F)	96 mm (3.8 inches)	72%	high
October Weather	10°C (51°F)	150 mm (5.9 inches)	81%	high
November Weather	2°C (37°F)	112 mm (4.4 inches)	87%	moderate
December Weather	-2°C (28°F)	108 mm (4.2 inches)	84%	low