January Weather in Saint Peters, United States

Last updated: June 24, 2025

In January, the average temperature in Saint Peters, United States hovers around 0°C (32°F), with extremes ranging from a chilly -22°C (-6°F) to a warm 19°C (67°F). Expect about 72 mm (2.9 in) of precipitation over approximately 7 days, while the air remains comfortably humid with an average humidity of 82%.

January Temperature in Saint Peters

In January in Saint Peters, the average temperature is 0°C (32°F). Maximum temperatures can reach up to 19°C (67°F), while minimum temperatures can drop as low as -22°C (-6°F). Be prepared for a wide range of temperatures when traveling during this month, and pack accordingly!

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

The chart illustrates January temperature patterns in Saint Peters, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Peters, January typically has an average temperature of 0°C (32°F), with highs reaching up to 19°C (67°F) and lows dropping to around -22°C (-6°F).

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

January Precipitation in Saint Peters

In Saint Peters in January, the precipitation amount is 72 mm (2.9 in) over the course of 7 days.

January Precipitation Trends in Saint Peters

The chart displays monthly precipitation patterns in Saint Peters, 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 Peters, January typically receives around 72 mm (2.9 inches) of precipitation spread over approximately 7 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 Peters

In Saint Peters in January, humidity is 82%. With an average temperature of 0°C (32°F), this humidity feels like an icy breath enveloping you, making each step outdoors a challenge as the cold dampness seeps into your clothes, chilling you to the bone and sapping your energy while traveling.

January Average Humidity in Saint Peters

This chart illustrates the average monthly humidity levels in Saint Peters, 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 Peters is approximately 82%, 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 Peters

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

Maximum UV Index Levels in Saint Peters for January

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

Data source: Saint Peters 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 Peters Compares to Other Months

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

This table compares monthly weather conditions in Saint Peters, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	72 mm (2.9 inches)	82%	moderate
February Weather	2°C (35°F)	78 mm (3.1 inches)	80%	moderate
March Weather	8°C (47°F)	128 mm (5.0 inches)	80%	high
April Weather	13°C (55°F)	121 mm (4.8 inches)	80%	very high
May Weather	19°C (67°F)	145 mm (5.7 inches)	82%	very high
June Weather	25°C (76°F)	84 mm (3.3 inches)	83%	extreme
July Weather	26°C (80°F)	97 mm (3.8 inches)	81%	extreme
August Weather	24°C (76°F)	139 mm (5.5 inches)	80%	very high
September Weather	22°C (72°F)	56 mm (2.2 inches)	76%	very high
October Weather	15°C (59°F)	110 mm (4.3 inches)	76%	high
November Weather	7°C (44°F)	68 mm (2.7 inches)	85%	moderate
December Weather	4°C (39°F)	52 mm (2.1 inches)	86%	moderate