Rockford Snowfall Totals & Accumulation Averages





This page pulls together information on when, how much and how often Rockford, Illinois has snow.

There are data and descriptions here of how many days it snows and the total amount of snowfall that Rockford usually gets. There are also monthly and yearly counts of the days that Rockford normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Rockford can expect the first and last snowfalls of the season.

The first set of monthly snow totals are averages for 2010 to 2019. All the other numbers are averages, based on climate data gathered from 1991 to 2020 at the Rockford Airport.

How Often it Snows in Rockford

The next two tables list monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).

10-year snowfall averages at Rockford, 2010 to 2019
Days   Inches Centi­metres
3.2 January 9.5 24.0
4.1 February 12.5 31.8
1.1 March 4.5 11.4
0.4 April 1.1 2.9
0.1 October 0.4 1.1
0.7 November 3.4 8.6
2.3 December 7.0 17.8
11.9 Year 38.5 97.7
30-year snowfall averages at Rockford, 1991 to 2020
Days   Inches Centi­metres
8.2 January 10.9 27.7
6.5 February 8.5 21.6
3.9 March 4.9 12.4
0.9 April 0.9 2.3
0.2 October 0.2 0.5
1.6 November 2.3 5.8
6.8 December 9.4 23.9
28.1 Year 37.1 94.2

These averages don't show how much Rockford's snowfall varies from year to year.

In December, for instance, one in four years totals over 14.6 inches of snow. Another 25 percent of years receive less than 1.8 inches for the month.

Similarly in January, fresh snowfall in the heaviest years also amounts to over 14.6 inches, while the lightest years get less than 6.4 inches.

Snow in February ranges from over 13.8 inches in heavy snowfall years to under 2.3 inches in light years.

When Rockford Has Its First & Last Snowfalls

Over the long-term Rockford has averaged a fifth of an inch of snow during October, but snow rarely arrives that early. Rockford's first snowfall of winter usually shows up in November.

Most Aprils get at least a dusting of snow. Less commonly, the last snowfall of the season happens in March.

Rockford is normally free of snow every year from May to September.

How Many Snowstorms Rockford Gets

Most days of snowfall in Rockford result in just a skiff of less than an inch left on the ground. On an average of 11 days a year, at least an inch of snow lands in one day.

Snowstorms of over five inches a day normally occur once a year. Major blizzards that dump ten inches or more in one day are rare here, showing up on an average of just once a decade.

Number of days per month and year on average in Rockford with a total snowfall of at least 1, 3, 5 or 10 inches
1 inch
2.5 cm
3 inches
7.6 cm
  5 inches
12.7 cm
10 inches
25.4 cm
3.6 1.2 January 0.3 0.0
2.8 0.8 February 0.2 0.1
1.3 0.5 March 0.2 0.0
0.3 0.1 April 0.0 0.0
0.5 0.2 November 0.1 0.0
2.6 1.1 December 0.4 0.0
11.1 3.9 Year 1.2 0.1

How Much Snow Normally Accumulates in Rockford

For about half of winter days, Rockford has at least an inch of snow on the ground.

Snow mostly accumulates during January. Typically, on ten days in January the snow covering Rockford gets to five or more inches deep. Rockford has a snowpack of at least ten inches for five or six days a year on average.

Average total days per month and year in Rockford with snow depth of at least 1, 3, 5 or 10 inches on the ground
1 inch
2.5 cm
3 inches
7.6 cm
  5 inches
12.7 cm
10 inches
25.4 cm
20.0 15.4 January 10.3 2.0
14.4 10.4 February 6.5 2.1
5.3 2.6 March 1.7 0.2
0.4 0.1 April 0.0 0.0
1.6 0.8 November 0.6 0.2
13.2 9.2 December 6.4 1.1
54.9 38.5 Year 25.5 5.6
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Illinois Snowfall
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