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January Weather in Mount Vernon, United States

Last updated: June 24, 2025

In Mount Vernon, United States, the average temperature in January hovers around -3°C (28°F). Expect chilly days, with a minimum temperature dropping to a frigid -23°C (-9°F) and highs reaching up to 9°C (49°F). Be prepared for approximately 70 mm (2.7 in) of precipitation spread over 13 days, and a notable 86% humidity that adds to the wintry ambiance.

January Temperature in Mount Vernon

In January in Mount Vernon, the average temperature is -3°C (28°F). Maximum can reach 9°C (49°F) and minimum can be as low as -23°C (-9°F). Travelers should be prepared for a wide temperature range and dress accordingly for cold weather activities.

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 (28°F), with highs reaching up to 9°C (49°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec272835415058696757443428
Data source: Temperature data for Mount Vernon generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Mount Vernon

In Mount Vernon in January, the precipitation amount is 70 mm (2.7 in) over the course of 13 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 70 mm (2.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec701017880734131431566267
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Mount Vernon

In Mount Vernon in January, humidity is 86%. With an average temperature of -3°C (28°F), this humidity feels like a biting chill that seeps through layers of clothing, making travel outside quite uncomfortable and necessitating frequent warm-up breaks indoors.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110108642
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)70 mm (2.7 inches)86%moderate
February Weather-2°C (29°F)101 mm (4.0 inches)86%moderate
March Weather2°C (35°F)78 mm (3.1 inches)85%high
April Weather5°C (41°F)80 mm (3.1 inches)83%very high
May Weather10°C (50°F)73 mm (2.9 inches)77%very high
June Weather15°C (59°F)41 mm (1.6 inches)81%extreme
July Weather20°C (69°F)3 mm (0.1 inches)76%very high
August Weather20°C (68°F)14 mm (0.6 inches)60%very high
September Weather14°C (58°F)31 mm (1.2 inches)58%very high
October Weather6°C (44°F)56 mm (2.2 inches)75%high
November Weather1°C (35°F)62 mm (2.4 inches)85%moderate
December Weather-2°C (28°F)67 mm (2.6 inches)87%low

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