January Weather in Onalaska, United States

Last updated: June 24, 2025

In January, the average temperature in Onalaska, United States hovers around 5°C (41°F). During this month, temperatures can dip as low as -10°C (15°F), while highs can reach a pleasant 15°C (60°F). Expect 188 mm (7.4 in) of precipitation spread over 16 days, contributing to an average humidity level of 86%. Stay prepared for a chilly and damp climate!

January Temperature in Onalaska

In January in Onalaska, the average temperature is 5°C (41°F). Maximum temperatures can reach 15°C (60°F), while minimums can dip as low as -10°C (15°F). Be prepared for a wide range of weather conditions while traveling during this time.

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

The chart illustrates January 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, January typically has an average temperature of 5°C (41°F), with highs reaching up to 15°C (60°F) and lows dropping to around -10°C (15°F).

Data source: Temperature data for Onalaska generated using information from the Copernicus Climate Change Service.

January Precipitation in Onalaska

In Onalaska in January, the total precipitation amount is 188 mm (7.4 in), observed over a span of 16 days.

January Precipitation Trends in Onalaska

The chart displays monthly precipitation patterns in Onalaska, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Onalaska, January typically receives around 188 mm (7.4 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Onalaska

In Onalaska in January humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

January Average Humidity in Onalaska

This chart illustrates the average monthly humidity levels in Onalaska, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Onalaska is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Onalaska

In Onalaska in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Onalaska in January, 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 January, the maximum UV index in Onalaska typically reaches 2, which falls under the low exposure category.

Data source: Onalaska January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	188 mm (7.4 inches)	86%	low
February Weather	4°C (39°F)	196 mm (7.7 inches)	84%	moderate
March Weather	6°C (44°F)	151 mm (5.9 inches)	85%	moderate
April Weather	9°C (49°F)	129 mm (5.1 inches)	83%	high
May Weather	13°C (55°F)	80 mm (3.2 inches)	84%	very high
June Weather	15°C (60°F)	62 mm (2.4 inches)	84%	very high
July Weather	18°C (65°F)	12 mm (0.5 inches)	82%	very high
August Weather	19°C (66°F)	15 mm (0.6 inches)	73%	very high
September Weather	16°C (60°F)	86 mm (3.4 inches)	74%	high
October Weather	10°C (50°F)	149 mm (5.9 inches)	83%	moderate
November Weather	7°C (44°F)	187 mm (7.3 inches)	86%	moderate
December Weather	4°C (40°F)	202 mm (8.0 inches)	87%	low