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December Weather in Saint Peter, United States

Last updated: June 24, 2025

In December, the average temperature in Saint Peter, United States hovers around -2°C (29°F), but be prepared for extremes, with minimums plunging to -25°C (-12°F) and maximums reaching a surprising 18°C (65°F). Expect a precipitation total of 46 mm (1.8 in) spread over 6 days, contributing to an average humidity of 81%. Stay warm and dry during your visit!

December Temperature in Saint Peter

In December in Saint Peter, the average temperature is -2°C (29°F), with a maximum that can reach 18°C (65°F) and a minimum that can drop as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures, from chilly days to unexpectedly warm spells.

December Weather in Saint Peter: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Peter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Peter, December typically has an average temperature of -2°C (29°F), with highs reaching up to 18°C (65°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec212234445768737064513628
Data source: Temperature data for Saint Peter 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 Saint Peter

In Saint Peter in December, the precipitation amount is 46 mm (1.8 in) over a span of 6 days.

December Precipitation Trends in Saint Peter

The chart displays monthly precipitation patterns in Saint Peter, 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 Saint Peter, December typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec47475810311810410893831064446
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Saint Peter

In Saint Peter in December humidity is 81%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm while traveling.

December Average Humidity in Saint Peter

This chart illustrates the average monthly humidity levels in Saint Peter, 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 Saint Peter is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Peter

In Saint Peter in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Saint Peter, you can visit Hourly UV Index in Saint Peter.

Maximum UV Index Levels in Saint Peter for December

The chart shows the monthly maximum UV Index (UVI) for Saint Peter 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 Saint Peter typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Saint Peter 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 Saint Peter Compares to Other Months

Weather in Saint Peter varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Saint Peter, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Saint Peter, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)47 mm (1.9 inches)85%low
February Weather-6°C (22°F)47 mm (1.9 inches)85%moderate
March Weather1°C (34°F)58 mm (2.3 inches)85%moderate
April Weather7°C (44°F)103 mm (4.1 inches)85%very high
May Weather14°C (58°F)118 mm (4.6 inches)78%very high
June Weather20°C (69°F)104 mm (4.1 inches)80%very high
July Weather23°C (74°F)108 mm (4.2 inches)78%very high
August Weather21°C (71°F)93 mm (3.7 inches)76%very high
September Weather18°C (64°F)83 mm (3.3 inches)79%high
October Weather10°C (51°F)106 mm (4.2 inches)83%moderate
November Weather2°C (36°F)44 mm (1.7 inches)88%moderate
December Weather-2°C (29°F)46 mm (1.8 inches)81%low

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