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December Weather in Onalaska, United States

Last updated: June 24, 2025

In December, the average temperature in Onalaska, United States hovers around 4°C (40°F), with a minimum dipping to -6°C (21°F) and climbing to a maximum of 14°C (57°F). Expect 202 mm (8.0 in) of precipitation spread over 19 days, contributing to a notably high average humidity of 87%. Embrace the cozy ambiance this season brings!

December Temperature in Onalaska

In December in Onalaska, the average temperature is 4°C (40°F), with maximums reaching 14°C (57°F) and minimums dropping as low as -6°C (21°F). Travelers should be prepared for a cool climate and pack accordingly, ensuring comfort for both mild and chilly conditions.

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 4°C (40°F), with highs reaching up to 14°C (57°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec403944485560646660504440
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 202 mm (8.0 in) spread over 19 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 202 mm (8.0 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec1881961511298062121586149187202
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 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

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.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%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 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 Onalaska, you can visit 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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356910987532
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 Weather5°C (41°F)188 mm (7.4 inches)86%low
February Weather4°C (39°F)196 mm (7.7 inches)84%moderate
March Weather6°C (44°F)151 mm (5.9 inches)85%moderate
April Weather9°C (49°F)129 mm (5.1 inches)83%high
May Weather13°C (55°F)80 mm (3.2 inches)84%very high
June Weather15°C (60°F)62 mm (2.4 inches)84%very high
July Weather18°C (65°F)12 mm (0.5 inches)82%very high
August Weather19°C (66°F)15 mm (0.6 inches)73%very high
September Weather16°C (60°F)86 mm (3.4 inches)74%high
October Weather10°C (50°F)149 mm (5.9 inches)83%moderate
November Weather7°C (44°F)187 mm (7.3 inches)86%moderate
December Weather4°C (40°F)202 mm (8.0 inches)87%low

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