January Weather in Rock Falls, United States

Last updated: June 24, 2025

In January, the average temperature in Rock Falls, United States is a chilly -5°C (24°F). Expect extremes, with temperatures dipping as low as -32°C (-25°F) and reaching a high of 13°C (55°F). Precipitation averages 59 mm (2.3 in) over 8 days, contributing to a notably high average humidity of 82%. Prepare accordingly for a cold and damp climate!

January Temperature in Rock Falls

In January in Rock Falls, the average temperature is -5°C (24°F), with maximums reaching up to 13°C (55°F) and minimums dropping as low as -32°C (-25°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to stay comfortable during their visit.

January Weather in Rock Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Rock Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Falls, January typically has an average temperature of -5°C (24°F), with highs reaching up to 13°C (55°F) and lows dropping to around -32°C (-25°F).

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

January Precipitation in Rock Falls

In Rock Falls in January, the total precipitation amount is 59 mm (2.3 in) spread over 8 days.

January Precipitation Trends in Rock Falls

The chart displays monthly precipitation patterns in Rock Falls, 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 Rock Falls, January typically receives around 59 mm (2.3 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 Rock Falls

In Rock Falls in January humidity is 82%. With an average temperature of -5°C (24°F), this humidity feels like an icy shroud enveloping you, making every breath a sharp reminder of the cold as moisture clings to your skin, potentially turning your travel experience into a balance between breathtaking winter scenery and the biting chill that is exacerbated by the dampness in the air.

January Average Humidity in Rock Falls

This chart illustrates the average monthly humidity levels in Rock Falls, 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 Rock Falls is approximately 82%, 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 Rock Falls

In Rock Falls in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Rock Falls, you can check the information here.

Maximum UV Index Levels in Rock Falls for January

The chart shows the monthly maximum UV Index (UVI) for Rock Falls 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 Rock Falls typically reaches 3, which falls under the moderate exposure category.

Data source: Rock Falls 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 Rock Falls Compares to Other Months

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

This table compares monthly weather conditions in Rock Falls, 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 (24°F)	59 mm (2.3 inches)	82%	moderate
February Weather	-3°C (26°F)	59 mm (2.3 inches)	83%	moderate
March Weather	4°C (40°F)	86 mm (3.4 inches)	84%	high
April Weather	9°C (49°F)	110 mm (4.3 inches)	85%	very high
May Weather	17°C (62°F)	157 mm (6.2 inches)	79%	very high
June Weather	23°C (73°F)	141 mm (5.6 inches)	82%	very high
July Weather	24°C (76°F)	98 mm (3.8 inches)	80%	very high
August Weather	23°C (73°F)	73 mm (2.9 inches)	81%	very high
September Weather	20°C (68°F)	115 mm (4.5 inches)	80%	very high
October Weather	12°C (54°F)	115 mm (4.5 inches)	82%	high
November Weather	4°C (39°F)	51 mm (2.0 inches)	88%	moderate
December Weather	0°C (32°F)	50 mm (2.0 inches)	84%	low