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.
All the numbers are averages, based on climate data gathered from 1981 to 2010 at the Rockford Airport.
How Often it Snows in Rockford
This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).
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 18.2 inches of snow. Another 25 percent of years receive less than 3.8 inches for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 14.3 inches, while the lightest years get less than 6.9 inches.
Snow in February ranges from over 11.8 inches in heavy snowfall years to under 2.2 inches in light years.
When Rockford Has Its First & Last Snowfalls
Over the long-term Rockford has averaged a tenth of an inch of snow during October. But in nearly every year, October has no snow. Rockford's first snowfall of winter usually arrives in November.
Most April's get at least a dusting of snow. For in one out of four years, 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 essentially unheard of here.
How Much Snow Normally Accumulates in Rockford
For about two-thirds of winter days, Rockford has at least an inch of snow on the ground.
Snow mostly accumulates during January. Typically, on 13 days in January the snow covering Rockford gets to five or more inches deep. Rockford has a snowpack of at least ten inches for three or four days a year on average.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.