January Weather in Rockville, United States

Last updated: June 24, 2025

In January, the average temperature in Rockville, United States hovers around -10°C (15°F), with chilly nights dropping to a minimum of -35°C (-30°F) and daytime highs reaching up to 8°C (46°F). Expect around 19 mm (0.8 in) of precipitation over 4 days, complemented by an average humidity of 87%, creating an invigoratingly crisp atmosphere.

January Temperature in Rockville

In January in Rockville, the average temperature is -10°C (15°F). Maximum can reach 8°C (46°F) and minimum can be as low as -35°C (-30°F). Travelers should be prepared for extremely cold conditions and consider appropriate winter clothing and gear for outdoor activities.

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

The chart illustrates January temperature patterns in Rockville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockville, January typically has an average temperature of -10°C (15°F), with highs reaching up to 8°C (46°F) and lows dropping to around -35°C (-30°F).

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

January Precipitation in Rockville

In Rockville in January, the precipitation amount is 19 mm (0.8 in) over a span of 4 days.

January Precipitation Trends in Rockville

The chart displays monthly precipitation patterns in Rockville, 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 Rockville, January typically receives around 19 mm (0.8 inches) of precipitation spread over approximately 4 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Rockville

In Rockville in January, humidity is 87%. With an average temperature of -10°C (15°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and the air feel heavy with frost.

January Average Humidity in Rockville

This chart illustrates the average monthly humidity levels in Rockville, 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 Rockville is approximately 87%, 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 Rockville

In Rockville in January, 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 Rockville, you can visit Hourly UV Index in Rockville.

Maximum UV Index Levels in Rockville for January

The chart shows the monthly maximum UV Index (UVI) for Rockville 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 Rockville typically reaches 2, which falls under the low exposure category.

Data source: Rockville 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 Rockville Compares to Other Months

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

This table compares monthly weather conditions in Rockville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	19 mm (0.8 inches)	87%	low
February Weather	-10°C (15°F)	24 mm (1.0 inches)	90%	moderate
March Weather	0°C (31°F)	50 mm (2.0 inches)	85%	moderate
April Weather	5°C (42°F)	81 mm (3.2 inches)	84%	high
May Weather	14°C (58°F)	95 mm (3.7 inches)	78%	very high
June Weather	21°C (71°F)	69 mm (2.7 inches)	80%	very high
July Weather	23°C (74°F)	98 mm (3.9 inches)	81%	very high
August Weather	21°C (70°F)	143 mm (5.6 inches)	81%	very high
September Weather	17°C (63°F)	115 mm (4.5 inches)	81%	high
October Weather	8°C (47°F)	103 mm (4.1 inches)	84%	moderate
November Weather	0°C (32°F)	29 mm (1.2 inches)	88%	moderate
December Weather	-6°C (22°F)	45 mm (1.8 inches)	84%	low