January Weather in Petersburg, United States

Last updated: June 24, 2025

In January, the average temperature in Petersburg, United States hovers around -2°C (29°F), with extremes ranging from a chilling -27°C (-17°F) to a mild 17°C (62°F). Expect about 67 mm (2.6 in) of precipitation spread over 8 days, while the air remains quite humid at an average of 84%. Prepare for a mix of weather, fitting for this winter month!

January Temperature in Petersburg

In January in Petersburg, the average temperature is -2°C (29°F), with maximums reaching 17°C (62°F) and minimums dropping as low as -27°C (-17°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

January Weather in Petersburg: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Petersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Petersburg, January typically has an average temperature of -2°C (29°F), with highs reaching up to 17°C (62°F) and lows dropping to around -27°C (-17°F).

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

January Precipitation in Petersburg

In Petersburg in January, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

January Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, 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 Petersburg, January typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 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 Petersburg

In Petersburg in January, humidity is 84%. With an average temperature of -2°C (29°F), this humidity feels like an icy blanket that clings to your skin, making it difficult to stay warm and comfortable while traveling.

January Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, 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 Petersburg is approximately 84%, 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 Petersburg

In Petersburg 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 Petersburg, you can check the information here.

Maximum UV Index Levels in Petersburg for January

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

Data source: Petersburg 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 Petersburg Compares to Other Months

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

This table compares monthly weather conditions in Petersburg, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	67 mm (2.6 inches)	84%	moderate
February Weather	0°C (32°F)	67 mm (2.6 inches)	82%	moderate
March Weather	6°C (44°F)	132 mm (5.2 inches)	84%	high
April Weather	11°C (53°F)	127 mm (5.0 inches)	83%	very high
May Weather	18°C (66°F)	146 mm (5.7 inches)	80%	very high
June Weather	24°C (75°F)	130 mm (5.1 inches)	83%	extreme
July Weather	25°C (78°F)	117 mm (4.6 inches)	82%	extreme
August Weather	24°C (75°F)	86 mm (3.4 inches)	82%	very high
September Weather	22°C (71°F)	66 mm (2.6 inches)	79%	very high
October Weather	14°C (57°F)	108 mm (4.3 inches)	79%	high
November Weather	5°C (42°F)	67 mm (2.6 inches)	88%	moderate
December Weather	2°C (36°F)	52 mm (2.0 inches)	87%	moderate