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December Weather in Petersburg, United States

Last updated: June 24, 2025

In Petersburg, United States, the average temperature in December hovers around 7°C (44°F), with extremes ranging from a brisk -10°C (15°F) to a warm 27°C (80°F). Expect 19 mm (0.7 in) of precipitation over approximately 2 days, and prepare for a rather humid atmosphere with an average humidity of 82%.

December Temperature in Petersburg

In December in Petersburg, the average temperature is 7°C (44°F). The maximum can reach 27°C (80°F) and the minimum can be as low as -10°C (15°F). Be prepared for a wide range of temperatures to fully enjoy your travels in Petersburg during this month.

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 7°C (44°F), with highs reaching up to 27°C (80°F) and lows dropping to around -10°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec404354607078818073615044
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 19 mm (0.7 in) over a span of 2 days.

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 19 mm (0.7 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec181348366855303558461619
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 82%. With an average temperature of 7°C (44°F), this humidity feels like an unwelcoming chill that seeps into your bones, making outdoor exploration feel damp and cumbersome.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%74%66%70%75%79%78%71%69%70%82%82%
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 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 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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111112121210864
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 Weather5°C (41°F)18 mm (0.7 inches)75%moderate
February Weather6°C (43°F)13 mm (0.5 inches)74%high
March Weather12°C (54°F)48 mm (1.9 inches)66%very high
April Weather16°C (60°F)36 mm (1.4 inches)70%extreme
May Weather21°C (71°F)68 mm (2.7 inches)75%extreme
June Weather26°C (78°F)55 mm (2.2 inches)79%extreme
July Weather27°C (81°F)30 mm (1.2 inches)78%extreme
August Weather27°C (80°F)35 mm (1.4 inches)71%extreme
September Weather23°C (74°F)57 mm (2.3 inches)69%very high
October Weather16°C (61°F)46 mm (1.8 inches)70%very high
November Weather10°C (51°F)16 mm (0.6 inches)82%high
December Weather7°C (44°F)19 mm (0.7 inches)82%moderate

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