January Weather in Mount Vernon, United States

Last updated: June 24, 2025

In January, the average temperature in Mount Vernon, United States hovers around 3°C (38°F), with a potential minimum dipping to -18°C (-1°F) and a maximum reaching up to 21°C (70°F). This month experiences an average precipitation of 99 mm (3.9 in) spread over 11 days, contributing to a high average humidity of 88%.

January Temperature in Mount Vernon

In January in Mount Vernon, the average temperature is 3°C (38°F). The maximum can reach 21°C (70°F) while the minimum can drop as low as -18°C (-1°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

January Weather in Mount Vernon: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Mount Vernon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Vernon, January typically has an average temperature of 3°C (38°F), with highs reaching up to 21°C (70°F) and lows dropping to around -18°C (-1°F).

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

January Precipitation in Mount Vernon

In Mount Vernon, in January, the precipitation amount is 99 mm (3.9 in) over the course of 11 days.

January Precipitation Trends in Mount Vernon

The chart displays monthly precipitation patterns in Mount Vernon, 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 Mount Vernon, January typically receives around 99 mm (3.9 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 Mount Vernon

In Mount Vernon in January, humidity is 88%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while traveling.

January Average Humidity in Mount Vernon

This chart illustrates the average monthly humidity levels in Mount Vernon, 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 Mount Vernon is approximately 88%, 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 Mount Vernon

In Mount Vernon 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 Mount Vernon, you can check the information here.

Maximum UV Index Levels in Mount Vernon for January

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

Data source: Mount Vernon 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 Mount Vernon Compares to Other Months

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

This table compares monthly weather conditions in Mount Vernon, 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)	99 mm (3.9 inches)	88%	moderate
February Weather	6°C (43°F)	182 mm (7.2 inches)	88%	high
March Weather	10°C (49°F)	139 mm (5.5 inches)	87%	high
April Weather	14°C (57°F)	135 mm (5.3 inches)	84%	very high
May Weather	20°C (68°F)	128 mm (5.0 inches)	84%	extreme
June Weather	23°C (73°F)	148 mm (5.8 inches)	83%	extreme
July Weather	25°C (78°F)	105 mm (4.1 inches)	79%	extreme
August Weather	24°C (76°F)	117 mm (4.6 inches)	66%	very high
September Weather	22°C (72°F)	121 mm (4.7 inches)	67%	very high
October Weather	16°C (61°F)	118 mm (4.6 inches)	76%	high
November Weather	8°C (46°F)	80 mm (3.1 inches)	89%	moderate
December Weather	6°C (43°F)	139 mm (5.5 inches)	88%	moderate