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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 0°C (33°F), offering a chilly snapshot of winter. The mercury can dip as low as -25°C (-13°F) and rise to a maximum of 12°C (53°F). Expect considerable precipitation, with 258 mm (10.2 in) falling across 19 days, and high humidity levels at 91%, making for a brisk and often damp climate.

December Temperature in Petersburg

In December in Petersburg, the average temperature is 0°C (33°F). The maximum can reach 12°C (53°F), while the minimum can drop as low as -25°C (-13°F). It's essential to pack warmly and be prepared for sudden temperature changes when traveling during this time.

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 0°C (33°F), with highs reaching up to 12°C (53°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec302935425055595854433732
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 total precipitation amount is 258 mm (10.2 in) recorded over a span of 19 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 258 mm (10.2 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec225177177190160206195297288276309258
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 91%. With an average temperature of 0°C (33°F), this humidity feels like an icy dampness that seeps into your bones, making every step feel heavier and requiring extra layers to stay warm while traveling.

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 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%84%86%88%88%96%110%111%104%96%92%91%
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 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Petersburg.

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 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123566775311
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-1°C (30°F)225 mm (8.9 inches)88%low
February Weather-2°C (29°F)176 mm (6.9 inches)84%low
March Weather1°C (35°F)177 mm (7.0 inches)86%moderate
April Weather5°C (42°F)190 mm (7.5 inches)88%moderate
May Weather10°C (50°F)160 mm (6.3 inches)88%high
June Weather13°C (55°F)206 mm (8.1 inches)96%high
July Weather15°C (59°F)195 mm (7.7 inches)110%high
August Weather15°C (59°F)297 mm (11.7 inches)111%high
September Weather12°C (54°F)288 mm (11.3 inches)104%moderate
October Weather6°C (44°F)276 mm (10.9 inches)96%moderate
November Weather3°C (38°F)309 mm (12.2 inches)92%low
December Weather0°C (33°F)258 mm (10.2 inches)91%low

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