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December Weather in Onalaska, United States

Last updated: June 24, 2025

In December, the average temperature in Onalaska, United States is a mild 13°C (56°F). Temperatures can vary significantly, with minimums dipping to 1°C (34°F) and maximums reaching up to 27°C (80°F). Expect around 111 mm (4.4 in) of precipitation spread over 10 days, contributing to an average humidity of a high 87%.

December Temperature in Onalaska

In December in Onalaska, the average temperature is 13°C (56°F), with maximums reaching 27°C (80°F) and minimums dipping as low as 1°C (34°F). Be prepared for a wide range of temperatures when traveling to Onalaska during this time.

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

The chart illustrates December temperature patterns in Onalaska, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onalaska, December typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (80°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec525563687681838380716056
Data source: Temperature data for Onalaska 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 Onalaska

In Onalaska in December, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

December Precipitation Trends in Onalaska

The chart displays monthly precipitation patterns in Onalaska, 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 Onalaska, December typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec107112971151741359015213811771111
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Onalaska

In Onalaska in December humidity is 87%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it challenging to explore comfortably.

December Average Humidity in Onalaska

This chart illustrates the average monthly humidity levels in Onalaska, 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 Onalaska is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Onalaska

In Onalaska in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Onalaska.

Maximum UV Index Levels in Onalaska for December

The chart shows the monthly maximum UV Index (UVI) for Onalaska 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 Onalaska typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110865
Data source: Onalaska 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 Onalaska Compares to Other Months

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

This table compares monthly weather conditions in Onalaska, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)107 mm (4.2 inches)79%moderate
February Weather13°C (55°F)112 mm (4.4 inches)80%very high
March Weather17°C (64°F)97 mm (3.8 inches)78%very high
April Weather20°C (68°F)115 mm (4.5 inches)79%extreme
May Weather24°C (76°F)174 mm (6.8 inches)81%extreme
June Weather27°C (82°F)135 mm (5.3 inches)77%extreme
July Weather28°C (84°F)90 mm (3.5 inches)71%extreme
August Weather29°C (84°F)152 mm (6.0 inches)67%extreme
September Weather27°C (80°F)137 mm (5.4 inches)69%very high
October Weather22°C (71°F)117 mm (4.6 inches)73%very high
November Weather16°C (60°F)71 mm (2.8 inches)82%high
December Weather13°C (56°F)111 mm (4.4 inches)87%moderate

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