January Weather in Onalaska, United States

Last updated: June 24, 2025

In Onalaska, United States, the average temperature in January hovers around 11°C (52°F). Expect a minimum of -7°C (19°F) and a maximum of 27°C (80°F). During this month, the region experiences approximately 107 mm (4.2 in) of precipitation over about 8 days, with an average humidity of 79%. Stay prepared for a mix of chilly and warm days amid the occasional rain!

January Temperature in Onalaska

In January in Onalaska, the average temperature is 11°C (52°F), with maximums reaching 27°C (80°F) and minimums plummeting to as low as -7°C (19°F). This temperature range means that travelers should be prepared for a mix of warm days and chilly nights, making layered clothing essential for enjoying all that Onalaska has to offer.

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 11°C (52°F), with highs reaching up to 27°C (80°F) and lows dropping to around -7°C (19°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 107 mm (4.2 in), occurring over a span of 8 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 107 mm (4.2 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Onalaska

In Onalaska in January humidity is 79%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps through your clothes, making prolonged outdoor activities uncomfortable for travelers.

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 79%, 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 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 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 5, which falls under the moderate 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	11°C (52°F)	107 mm (4.2 inches)	79%	moderate
February Weather	13°C (55°F)	112 mm (4.4 inches)	80%	very high
March Weather	17°C (64°F)	97 mm (3.8 inches)	78%	very high
April Weather	20°C (68°F)	115 mm (4.5 inches)	79%	extreme
May Weather	24°C (76°F)	174 mm (6.8 inches)	81%	extreme
June Weather	27°C (82°F)	135 mm (5.3 inches)	77%	extreme
July Weather	28°C (84°F)	90 mm (3.5 inches)	71%	extreme
August Weather	29°C (84°F)	152 mm (6.0 inches)	67%	extreme
September Weather	27°C (80°F)	137 mm (5.4 inches)	69%	very high
October Weather	22°C (71°F)	117 mm (4.6 inches)	73%	very high
November Weather	16°C (60°F)	71 mm (2.8 inches)	82%	high
December Weather	13°C (56°F)	111 mm (4.4 inches)	87%	moderate