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December Weather in Wauwatosa, United States

Last updated: June 24, 2025

In December, the average temperature in Wauwatosa, United States hovers around 0°C (32°F). While you might experience a crisp chill with minimums reaching -20°C (-3°F), warmer days can surprise you with highs of 17°C (63°F). Expect 53 mm (2.1 in) of precipitation over 7 days, and stay prepared for a mild average humidity of 81%.

December Temperature in Wauwatosa

In December in Wauwatosa, the average temperature is 0°C (32°F). The maximum can reach 17°C (63°F), while the minimum can drop to as low as -20°C (-3°F). This varied climate makes Wauwatosa an intriguing destination for travelers who enjoy experiencing both chilly and mild weather.

December Weather in Wauwatosa: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Wauwatosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wauwatosa, December typically has an average temperature of 0°C (32°F), with highs reaching up to 17°C (63°F) and lows dropping to around -20°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec252635435465727165533832
Data source: Temperature data for Wauwatosa 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 Wauwatosa

In Wauwatosa in December, the total precipitation amount is 53 mm (2.1 in) spread over a period of 7 days.

December Precipitation Trends in Wauwatosa

The chart displays monthly precipitation patterns in Wauwatosa, 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 Wauwatosa, December typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec636068110138968275961215453
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Wauwatosa

In Wauwatosa in December, humidity is 81%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm and dry while traveling.

December Average Humidity in Wauwatosa

This chart illustrates the average monthly humidity levels in Wauwatosa, 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 Wauwatosa 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 Wauwatosa

In Wauwatosa 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 Wauwatosa, you can visit Hourly UV Index in Wauwatosa.

Maximum UV Index Levels in Wauwatosa for December

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

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

This table compares monthly weather conditions in Wauwatosa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)63 mm (2.5 inches)85%low
February Weather-4°C (26°F)60 mm (2.4 inches)85%moderate
March Weather2°C (36°F)68 mm (2.7 inches)85%moderate
April Weather6°C (44°F)109 mm (4.3 inches)85%very high
May Weather12°C (54°F)138 mm (5.4 inches)78%very high
June Weather18°C (66°F)96 mm (3.8 inches)80%very high
July Weather22°C (72°F)82 mm (3.2 inches)78%very high
August Weather22°C (72°F)75 mm (2.9 inches)76%very high
September Weather19°C (66°F)96 mm (3.8 inches)79%high
October Weather12°C (53°F)121 mm (4.8 inches)83%moderate
November Weather3°C (39°F)54 mm (2.1 inches)88%moderate
December Weather0°C (32°F)53 mm (2.1 inches)81%low

Compare Wauwatosa's Climate with Cities Worldwide