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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 2°C (36°F). During this month, temperatures can swing from a chilly -20°C (-3°F) to a mild 20°C (69°F). Expect 52 mm (2.0 in) of precipitation over about 7 days, alongside high humidity levels at 87%. Stay prepared for a mix of conditions!

December Temperature in Petersburg

In December in Petersburg, the average temperature is 2°C (36°F). The maximum can reach 20°C (69°F), while the minimum can drop as low as -20°C (-3°F). This climate offers a unique experience for travelers, highlighting the beauty of both warm and chilly days.

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 2°C (36°F), with highs reaching up to 20°C (69°F) and lows dropping to around -20°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec283143526575777471574236
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 52 mm (2.0 in) over a duration of 7 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 52 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec676713212714613011786661086752
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 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec357910111198643
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 Weather-2°C (29°F)67 mm (2.6 inches)84%moderate
February Weather0°C (32°F)67 mm (2.6 inches)82%moderate
March Weather6°C (44°F)132 mm (5.2 inches)84%high
April Weather11°C (53°F)127 mm (5.0 inches)83%very high
May Weather18°C (66°F)146 mm (5.7 inches)80%very high
June Weather24°C (75°F)130 mm (5.1 inches)83%extreme
July Weather25°C (78°F)117 mm (4.6 inches)82%extreme
August Weather24°C (75°F)86 mm (3.4 inches)82%very high
September Weather22°C (71°F)66 mm (2.6 inches)79%very high
October Weather14°C (57°F)108 mm (4.3 inches)79%high
November Weather5°C (42°F)67 mm (2.6 inches)88%moderate
December Weather2°C (36°F)52 mm (2.0 inches)87%moderate

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