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January Weather in Petersburg, United States

Last updated: June 24, 2025

In Petersburg, United States, the weather in January presents a chilly average temperature of 6°C (42°F). Expect temperatures to swing between a minimum of -14°C (7°F) and a maximum of 24°C (75°F). Rainfall can reach 114 mm (4.5 in) over about 10 days, with a notable average humidity of 87%.

January Temperature in Petersburg

In January in Petersburg, the average temperature is 6°C (42°F), with maximums reaching up to 24°C (75°F) and minimums dropping as low as -14°C (7°F). Travelers should prepare for a wide range of temperatures and pack accordingly for their visit.

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 6°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec424754607077807874644946
Data source: Temperature data for Petersburg 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 Petersburg

In Petersburg in January, the precipitation amount is 114 mm (4.5 in) over a period of 10 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 114 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec11418218515211013414211510911471144
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Petersburg

In Petersburg in January humidity is 87%. With an average temperature of 6°C (42°F), this humidity feels like a persistent chill that seeps into your bones, making it uncomfortable for traveling and leaving you longing for warmth at every turn.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Petersburg for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)114 mm (4.5 inches)87%moderate
February Weather8°C (47°F)182 mm (7.2 inches)87%high
March Weather12°C (54°F)185 mm (7.3 inches)85%very high
April Weather16°C (60°F)152 mm (6.0 inches)82%very high
May Weather21°C (71°F)110 mm (4.3 inches)83%very high
June Weather25°C (77°F)134 mm (5.3 inches)82%extreme
July Weather26°C (80°F)142 mm (5.6 inches)78%extreme
August Weather26°C (79°F)115 mm (4.5 inches)67%very high
September Weather23°C (75°F)109 mm (4.3 inches)64%very high
October Weather18°C (64°F)114 mm (4.5 inches)74%high
November Weather10°C (50°F)71 mm (2.8 inches)87%moderate
December Weather8°C (47°F)144 mm (5.7 inches)88%moderate

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