January Weather in Rockford, United States

Last updated: June 24, 2025

In January, the average temperature in Rockford, United States hovers around 5°C (42°F). Expect the mercury to dip as low as -14°C (8°F) and soar to a maximum of 23°C (75°F). With an average precipitation of 101 mm (4.0 in) spread over 11 days, you'll want to prepare for some wet weather. Additionally, the air is quite humid, with average humidity levels at 86%.

January Temperature in Rockford

In January in Rockford, the average temperature is 5°C (42°F), with maximums reaching 23°C (75°F) and minimums dropping as low as -14°C (8°F). It's advisable to pack layers for your trip, as the temperature can vary significantly throughout the day.

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

The chart illustrates January temperature patterns in Rockford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockford, January typically has an average temperature of 5°C (42°F), with highs reaching up to 23°C (75°F) and lows dropping to around -14°C (8°F).

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

January Precipitation in Rockford

In Rockford in January, the precipitation amount is 101 mm (4.0 in) spread over 11 days.

January Precipitation Trends in Rockford

The chart displays monthly precipitation patterns in Rockford, 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 Rockford, January typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 11 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 Rockford

In Rockford in January, humidity is 86%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your layers, making outdoor activities quite uncomfortable and prompting you to seek warmth indoors more often.

January Average Humidity in Rockford

This chart illustrates the average monthly humidity levels in Rockford, 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 Rockford 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 Rockford

In Rockford in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rockford for better planning.

Maximum UV Index Levels in Rockford for January

The chart shows the monthly maximum UV Index (UVI) for Rockford 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 Rockford typically reaches 4, which falls under the moderate exposure category.

Data source: Rockford 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 Rockford Compares to Other Months

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

This table compares monthly weather conditions in Rockford, 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 (42°F)	101 mm (4.0 inches)	86%	moderate
February Weather	8°C (47°F)	166 mm (6.5 inches)	86%	high
March Weather	11°C (53°F)	161 mm (6.3 inches)	86%	very high
April Weather	15°C (59°F)	133 mm (5.2 inches)	82%	very high
May Weather	20°C (69°F)	113 mm (4.5 inches)	85%	extreme
June Weather	24°C (75°F)	102 mm (4.0 inches)	85%	extreme
July Weather	26°C (79°F)	104 mm (4.1 inches)	83%	extreme
August Weather	25°C (77°F)	119 mm (4.7 inches)	76%	very high
September Weather	23°C (73°F)	90 mm (3.6 inches)	76%	very high
October Weather	17°C (63°F)	122 mm (4.8 inches)	80%	high
November Weather	9°C (49°F)	83 mm (3.3 inches)	88%	high
December Weather	7°C (45°F)	135 mm (5.3 inches)	88%	moderate