Rockford Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Rockford, Illinois. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Rockford?

In Rockford, June has the greatest precipitation of any month. On average, Rockford gets 5.2 inches of precipitation in June.

However, May is the month with the greatest chance of precipitation. 41.6% of days in May will have at least some rain.

What's the Driest Month in Rockford?

In Rockford, January has the least precipitation of any month. On average, Rockford gets 1.60 inches of precipitation in January.

September is the month with the lowest chance of precipitation. 28.1% of days in September will have measurable rain.

Month	Precipitation	% Chance
January	1.60 in	32.5
February	1.63 in	30.5
March	2.40 in	34.8
April	3.75 in	39.4
May	4.17 in	41.6
June	5.23 in	37.9
July	3.80 in	29.4
August	4.19 in	30.1
September	3.62 in	28.1
October	2.62 in	30.9
November	2.27 in	29.4
December	1.93 in	31.6
Year	37.21 in	33.0

Weather Station Details

Years	Station	Coordinates
1951–2024	Greater Rockford Airport	location
1893–1950	Rockford	location