January Weather in McLean, United States

Last updated: June 24, 2025

In January, the average temperature in McLean, United States hovers around 3°C (38°F). Expect a temperature range from a chilly -16°C (4°F) to a pleasantly warm 25°C (78°F). During this month, precipitation averages 23 mm (0.9 in) spread over 3 days, and the average humidity sits at a relatively high 75%.

January Temperature in McLean

In January in McLean, the average temperature is 3°C (38°F). Maximums can reach 25°C (78°F), while minimums can drop as low as -16°C (4°F). Be sure to pack layers to enjoy both the warmth of the day and the chill of the night during your travels.

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

The chart illustrates January temperature patterns in McLean, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McLean, January typically has an average temperature of 3°C (38°F), with highs reaching up to 25°C (78°F) and lows dropping to around -16°C (4°F).

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

January Precipitation in McLean

In McLean in January, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

January Precipitation Trends in McLean

The chart displays monthly precipitation patterns in McLean, 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 McLean, January typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 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 McLean

In McLean in January humidity is 75%. With an average temperature of 3°C (38°F), this humidity feels like a chill that clings to your skin, making outdoor exploration uncomfortable and urging you to seek warmth indoors.

January Average Humidity in McLean

This chart illustrates the average monthly humidity levels in McLean, 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 McLean is approximately 75%, 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 McLean

In McLean in January, 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 McLean for better planning.

Maximum UV Index Levels in McLean for January

The chart shows the monthly maximum UV Index (UVI) for McLean 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 McLean typically reaches 4, which falls under the moderate exposure category.

Data source: McLean 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 McLean Compares to Other Months

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

This table compares monthly weather conditions in McLean, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	23 mm (0.9 inches)	75%	moderate
February Weather	4°C (39°F)	15 mm (0.6 inches)	76%	high
March Weather	11°C (51°F)	59 mm (2.3 inches)	64%	very high
April Weather	14°C (58°F)	36 mm (1.4 inches)	70%	very high
May Weather	20°C (68°F)	82 mm (3.2 inches)	78%	extreme
June Weather	25°C (77°F)	59 mm (2.3 inches)	81%	extreme
July Weather	27°C (81°F)	36 mm (1.4 inches)	82%	extreme
August Weather	26°C (79°F)	43 mm (1.7 inches)	78%	extreme
September Weather	23°C (73°F)	50 mm (2.0 inches)	72%	very high
October Weather	15°C (59°F)	69 mm (2.7 inches)	73%	high
November Weather	9°C (49°F)	14 mm (0.5 inches)	80%	moderate
December Weather	6°C (42°F)	23 mm (0.9 inches)	81%	moderate