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December Weather in Petersburg, United States

Last updated: June 24, 2025

In December, the average temperature in Petersburg, United States hovers around 8°C (47°F). You can expect a minimum temperature of -8°C (17°F) and a maximum of 23°C (73°F). Prepare for a wet month, with 144 mm (5.7 in) of precipitation likely over 11 days. The high humidity level, averaging 88%, adds to the chilly atmosphere, so bundle up and enjoy this brisk month!

December Temperature in Petersburg

In December in Petersburg, the average temperature is 8°C (47°F). Maximum temperatures can reach 23°C (73°F), while minimums can drop as low as -8°C (17°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December 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, December typically has an average temperature of 8°C (47°F), with highs reaching up to 23°C (73°F) and lows dropping to around -8°C (17°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.

December Precipitation in Petersburg

In Petersburg in December, the precipitation amount is 144 mm (5.7 in) during 11 days, indicating a relatively wet period for the region.

December Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Petersburg, December typically receives around 144 mm (5.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec11418218515211013414211510911471144
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Petersburg

In Petersburg in December, humidity is 88%. With an average temperature of 8°C (47°F), this humidity feels like a thick, damp blanket wrapping around you, making even short walks feel heavy and uninviting for travel.

December Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Petersburg is approximately 88%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Petersburg

In Petersburg in December, 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 December

The chart shows the monthly maximum UV Index (UVI) for Petersburg in December, 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 December, the maximum UV index in Petersburg typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109753
Data source: Petersburg December 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 December 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 December’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 December’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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