January Weather in Onalaska, United States

Last updated: June 24, 2025

In January, the average temperature in Onalaska, United States hovers around -7°C (19°F), while it can dip as low as -33°C (-26°F) and peak at 9°C (49°F). Expect approximately 35 mm (1.4 in) of precipitation spread over 7 days, accompanied by an average humidity of 84%, giving you a true sense of the chilly atmosphere.

January Temperature in Onalaska

In January in Onalaska, the average temperature is -7°C (19°F). The maximum can reach 9°C (49°F), while the minimum can drop as low as -33°C (-26°F). Be sure to pack warm clothing if you're planning to travel 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 -7°C (19°F), with highs reaching up to 9°C (49°F) and lows dropping to around -33°C (-26°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 precipitation amount is 35 mm (1.4 in) over the course of 7 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 35 mm (1.4 inches) of precipitation spread over approximately 7 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 84%. With an average temperature of -7°C (19°F), this humidity feels like a biting chill that cuts through layers of clothing, making outdoor travel uncomfortable and prompting a need for frequent warm breaks indoors.

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 84%, 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	-7°C (19°F)	35 mm (1.4 inches)	84%	low
February Weather	-7°C (20°F)	49 mm (1.9 inches)	85%	moderate
March Weather	2°C (35°F)	57 mm (2.2 inches)	84%	moderate
April Weather	7°C (45°F)	86 mm (3.4 inches)	83%	very high
May Weather	15°C (59°F)	142 mm (5.6 inches)	75%	very high
June Weather	21°C (71°F)	139 mm (5.5 inches)	79%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	75%	very high
August Weather	21°C (70°F)	127 mm (5.0 inches)	69%	very high
September Weather	18°C (64°F)	109 mm (4.3 inches)	74%	high
October Weather	10°C (50°F)	118 mm (4.6 inches)	79%	moderate
November Weather	2°C (35°F)	53 mm (2.1 inches)	88%	moderate
December Weather	-3°C (26°F)	44 mm (1.7 inches)	82%	low