January Weather in Saint Marys, United States

Last updated: June 24, 2025

In Saint Marys, United States, the average temperature in January hovers around -4°C (26°F). Be prepared for extremes, as temperatures can drop to a chilling -26°C (-15°F) or rise to a mild 17°C (63°F). During this month, you can expect about 90 mm (3.5 in) of precipitation spread across 12 days. The air carries a notable humidity of 89%, adding to the winter’s crispness.

January Temperature in Saint Marys

In January in Saint Marys, the average temperature is -4°C (26°F). The maximum can reach 17°C (63°F), while the minimum can drop as low as -26°C (-15°F). Be sure to pack warm clothing and be prepared for significant temperature fluctuations when traveling during this month.

January Weather in Saint Marys: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Saint Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Marys, January typically has an average temperature of -4°C (26°F), with highs reaching up to 17°C (63°F) and lows dropping to around -26°C (-15°F).

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

January Precipitation in Saint Marys

In Saint Marys in January, the precipitation amount is 90 mm (3.5 in) spread over 12 days.

January Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Saint Marys, January typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 12 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 Saint Marys

In Saint Marys in January, humidity is 89%. With an average temperature of -4°C (26°F), this humidity feels like a biting chill that clings to your skin, making every step outdoors feel like traversing through a frosty fog.

January Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Saint Marys is approximately 89%, 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 Saint Marys

In Saint Marys 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 Saint Marys, you can check the information here.

Maximum UV Index Levels in Saint Marys for January

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

Data source: Saint Marys 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 Saint Marys Compares to Other Months

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

This table compares monthly weather conditions in Saint Marys, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	90 mm (3.5 inches)	89%	moderate
February Weather	-2°C (29°F)	107 mm (4.2 inches)	90%	moderate
March Weather	2°C (36°F)	94 mm (3.7 inches)	89%	high
April Weather	8°C (46°F)	124 mm (4.9 inches)	88%	very high
May Weather	14°C (58°F)	144 mm (5.7 inches)	80%	very high
June Weather	19°C (66°F)	123 mm (4.9 inches)	79%	very high
July Weather	21°C (71°F)	117 mm (4.6 inches)	74%	very high
August Weather	20°C (69°F)	94 mm (3.7 inches)	64%	very high
September Weather	17°C (63°F)	111 mm (4.4 inches)	67%	very high
October Weather	11°C (53°F)	125 mm (4.9 inches)	81%	high
November Weather	3°C (38°F)	94 mm (3.7 inches)	89%	moderate
December Weather	0°C (32°F)	98 mm (3.9 inches)	88%	low