January Weather in Potomac, United States

Last updated: June 24, 2025

In January, the average temperature in Potomac, United States hovers around -2°C (29°F). The weather can be quite extreme, with minimums plunging to -28°C (-17°F) and a maximum of 18°C (65°F). Prepare for potential precipitation, averaging 77 mm (3.0 in) over 8 days, while the air maintains a high average humidity of 82%.

January Temperature in Potomac

In January in Potomac, the average temperature is -2°C (29°F). The maximum can reach 18°C (65°F) and the minimum can be as low as -28°C (-17°F). Travelers should be prepared for a wide range of temperatures, making layering essential for comfort during this unpredictable weather.

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

The chart illustrates January temperature patterns in Potomac, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Potomac, January typically has an average temperature of -2°C (29°F), with highs reaching up to 18°C (65°F) and lows dropping to around -28°C (-17°F).

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

January Precipitation in Potomac

In Potomac in January, the precipitation amount is 77 mm (3.0 in) distributed over 8 days.

January Precipitation Trends in Potomac

The chart displays monthly precipitation patterns in Potomac, 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 Potomac, January typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 8 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 Potomac

In Potomac in January, humidity is 82%. With an average temperature of -2°C (29°F), this humidity feels like a frigid chill that seeps into your bones, making travel quite uncomfortable and forcing you to bundle up tightly to ward off the damp cold that lingers in the air.

January Average Humidity in Potomac

This chart illustrates the average monthly humidity levels in Potomac, 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 Potomac is approximately 82%, 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 Potomac

In Potomac 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 Potomac, you can check the information here.

Maximum UV Index Levels in Potomac for January

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

Data source: Potomac 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 Potomac Compares to Other Months

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

This table compares monthly weather conditions in Potomac, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	77 mm (3.0 inches)	82%	moderate
February Weather	-1°C (31°F)	77 mm (3.0 inches)	83%	moderate
March Weather	6°C (43°F)	111 mm (4.4 inches)	84%	high
April Weather	11°C (52°F)	118 mm (4.6 inches)	85%	very high
May Weather	18°C (65°F)	147 mm (5.8 inches)	79%	very high
June Weather	23°C (74°F)	112 mm (4.4 inches)	82%	extreme
July Weather	25°C (77°F)	87 mm (3.4 inches)	80%	very high
August Weather	23°C (74°F)	110 mm (4.3 inches)	81%	very high
September Weather	21°C (70°F)	76 mm (3.0 inches)	80%	very high
October Weather	14°C (57°F)	119 mm (4.7 inches)	82%	high
November Weather	5°C (41°F)	74 mm (2.9 inches)	88%	moderate
December Weather	2°C (36°F)	59 mm (2.3 inches)	84%	low