January Weather in Mount Vernon, United States

Last updated: June 24, 2025

In January, the average temperature in Mount Vernon, United States hovers around 8°C (46°F), but don't be surprised if you experience extremes—minimums can dip to -14°C (8°F) while highs can reach up to 25°C (78°F). Prepare for a moist atmosphere with an average humidity of 80% and expect about 95 mm (3.8 in) of precipitation spread over 9 days.

January Temperature in Mount Vernon

In January in Mount Vernon, the average temperature is 8°C (46°F). Maximums can reach 25°C (78°F), while minimums can drop as low as -14°C (8°F). Travelers should be prepared for a wide temperature range 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 8°C (46°F), with highs reaching up to 25°C (78°F) and lows dropping to around -14°C (8°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 total precipitation amount is 95 mm (3.8 in) over the course of 9 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 95 mm (3.8 inches) of precipitation spread over approximately 9 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 80%. With an average temperature of 8°C (46°F), this humidity feels like traveling through a damp and chilly mist, making even a short walk feel heavy and uncomfortable.

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 80%, 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 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 Mount Vernon for better planning.

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 4, 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	8°C (46°F)	95 mm (3.8 inches)	80%	moderate
February Weather	9°C (49°F)	142 mm (5.6 inches)	79%	high
March Weather	15°C (59°F)	132 mm (5.2 inches)	78%	very high
April Weather	18°C (64°F)	202 mm (7.9 inches)	78%	very high
May Weather	23°C (73°F)	173 mm (6.8 inches)	81%	extreme
June Weather	27°C (80°F)	101 mm (4.0 inches)	78%	extreme
July Weather	29°C (84°F)	72 mm (2.8 inches)	73%	extreme
August Weather	28°C (84°F)	78 mm (3.1 inches)	66%	extreme
September Weather	26°C (79°F)	80 mm (3.2 inches)	65%	very high
October Weather	19°C (67°F)	137 mm (5.4 inches)	72%	very high
November Weather	13°C (55°F)	63 mm (2.5 inches)	82%	high
December Weather	10°C (51°F)	105 mm (4.2 inches)	87%	moderate