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January Weather in St. Mary's, United States

Last updated: June 24, 2025

In January, the average temperature in St. Mary's, United States hovers around -14°C (7°F). However, be prepared for extremes, as the thermometer can dip to a chilling -38°C (-36°F) or rise to a mild 4°C (40°F). With 30 mm (1.2 in) of precipitation spread over 7 days and an impressive average humidity of 98%, this month can feel quite brisk and damp. Bundle up and enjoy the winter wonderland!

January Temperature in St. Mary's

In January in St. Mary's, the average temperature is -14°C (7°F). Maximums can reach 4°C (40°F), while minimums can drop as low as -38°C (-36°F). Travelers should prepare for extremely cold conditions and dress accordingly.

January Weather in St. Mary's: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in St. Mary's, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Mary's, January typically has an average temperature of -14°C (7°F), with highs reaching up to 4°C (40°F) and lows dropping to around -38°C (-36°F).
JanFebMarAprMayJunJulAugSepOctNovDec71217304555565446362013
Data source: Temperature data for St. Mary's 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 St. Mary's

In St. Mary's in January, the total precipitation amount is 30 mm (1.2 in) over a span of 7 days.

January Precipitation Trends in St. Mary's

The chart displays monthly precipitation patterns in St. Mary's, 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 St. Mary's, January typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec316554476455638691785559
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in St. Mary's

In St. Mary's in January, humidity is 98%. With an average temperature of -14°C (7°F), this humidity feels like a biting chill that seeps into your bones, making traveling feel like an uphill battle against the cold, damp air that clings to your skin.

January Average Humidity in St. Mary's

This chart illustrates the average monthly humidity levels in St. Mary's, 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 St. Mary's is approximately 98%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%96%85%78%80%86%89%91%92%90%93%98%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in St. Mary's

In St. Mary's in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in St. Mary's.

Maximum UV Index Levels in St. Mary's for January

The chart shows the monthly maximum UV Index (UVI) for St. Mary's 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 St. Mary's typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: St. Mary's 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 St. Mary's Compares to Other Months

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

This table compares monthly weather conditions in St. Mary's, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-14°C (7°F)30 mm (1.2 inches)98%low
February Weather-11°C (12°F)65 mm (2.6 inches)96%low
March Weather-8°C (17°F)54 mm (2.1 inches)85%moderate
April Weather-1°C (30°F)47 mm (1.8 inches)78%moderate
May Weather7°C (45°F)63 mm (2.5 inches)80%moderate
June Weather13°C (55°F)55 mm (2.2 inches)86%high
July Weather14°C (57°F)63 mm (2.5 inches)89%high
August Weather12°C (54°F)86 mm (3.4 inches)91%moderate
September Weather8°C (47°F)91 mm (3.6 inches)92%moderate
October Weather2°C (36°F)78 mm (3.1 inches)90%low
November Weather-7°C (20°F)55 mm (2.2 inches)93%low
December Weather-11°C (13°F)59 mm (2.3 inches)98%low

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