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December Weather in South Milwaukee, United States

Last updated: June 24, 2025

In December, the average temperature in South Milwaukee, United States is a chilly 1°C (34°F). Expect minimums plunging to -16°C (4°F) and highs reaching 14°C (57°F). Rainfall is relatively frequent, with about 63 mm (2.5 in) spread over 8 days, resulting in an average humidity of 81%. Prepare accordingly for a cold and damp month!

December Temperature in South Milwaukee

In December in South Milwaukee, the average temperature is 1°C (34°F). The maximum can reach 14°C (57°F) while the minimum can drop as low as -16°C (4°F). It's important to prepare for a wide range of temperatures if you plan to travel during this month.

December Weather in South Milwaukee: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Milwaukee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Milwaukee, December typically has an average temperature of 1°C (34°F), with highs reaching up to 14°C (57°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec272734394657687065544034
Data source: Temperature data for South Milwaukee 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 South Milwaukee

In South Milwaukee in December, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

December Precipitation Trends in South Milwaukee

The chart displays monthly precipitation patterns in South Milwaukee, 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 South Milwaukee, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec727176112145876160951396763
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Milwaukee

In South Milwaukee in December humidity is 81%. With an average temperature of 1°C (34°F), this humidity feels like a damp chill wrapping around you, making traveling uncomfortable as every breath feels heavy and the cold penetration intensifies with the moisture in the air.

December Average Humidity in South Milwaukee

This chart illustrates the average monthly humidity levels in South Milwaukee, 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 South Milwaukee 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 South Milwaukee

In South Milwaukee 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 South Milwaukee, you can visit Hourly UV Index in South Milwaukee.

Maximum UV Index Levels in South Milwaukee for December

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

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

This table compares monthly weather conditions in South Milwaukee, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)72 mm (2.8 inches)85%low
February Weather-3°C (28°F)71 mm (2.8 inches)85%moderate
March Weather1°C (34°F)76 mm (3.0 inches)85%moderate
April Weather4°C (39°F)112 mm (4.4 inches)85%very high
May Weather8°C (46°F)145 mm (5.7 inches)78%very high
June Weather14°C (58°F)87 mm (3.4 inches)80%very high
July Weather20°C (68°F)61 mm (2.4 inches)78%very high
August Weather21°C (70°F)60 mm (2.4 inches)76%very high
September Weather18°C (66°F)95 mm (3.7 inches)79%high
October Weather12°C (54°F)139 mm (5.5 inches)83%moderate
November Weather4°C (40°F)67 mm (2.6 inches)88%moderate
December Weather1°C (34°F)63 mm (2.5 inches)81%low

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