Heavy snow developed across northern Illinois during the afternoon of January 30th and continued into the afternoon of January 31st.  Most of Will and Cook counties saw snowfall totals of 10 to 13 inches, with a few higher reports.  The bulk of the rest of the Chicago metro area received 8 to 11 inches of snow with 6 to 9 inches across northwest Illinois.  The snow was falling at over an inch per hour at the peak of the storm late in the evening of January 30th into the early morning of January 31st.  The precipitation started as rain across LaSalle and Ford counties, changing to a period of freezing rain before changing to all snow.  Snowfall amounts rapidly decreased across southern La Salle, Livingston, Ford and southwest Iroquois counties.
Storm total snowfall included 15.3 inches five miles southeast of Monee; 13.8 inches in Harwood Heights; 13.5 inches near Elmhurst; 12.9 inches at the National Weather Service office in Romeoville; 12.7 inches in Thornton; 12.4 inches near Evanston and Downers Grove; 12.0 inches in Deerfield; 11.3 inches three miles southwest of Chicago Midway Airport; 11.1 inches near Algonquin; 11.0 inches in Lansing; 10.8 inches at Chicago O'Hare Airport; 10.7 inches in Joliet; 10.5 inches in Libertyville; 10.3 inches in Kankakee; 10.0 inches in Naperville and near Somonauk; 9.8 inches in De Kalb and in Antioch; 9.1 inches near Waukegan; 8.8 inches near St. Charles; 8.5 inches in Aurora; 7.8 inches in Sycamore and Lake Summerset; 7.4 inches four miles northwest of Coal City and 6.8 inches at the Rockford Airport.

Winter Storm in WINNEBAGO, ILLINOIS
From 30-JAN-21 15:30:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Storm in BOONE, ILLINOIS
From 30-JAN-21 16:00:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in LEE, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in OGLE, ILLINOIS
From 30-JAN-21 15:30:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in DE KALB, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in MCHENRY, ILLINOIS
From 30-JAN-21 16:30:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in LAKE, ILLINOIS
From 30-JAN-21 16:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in KANE, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in DU PAGE, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in NORTHERN COOK COUNTY, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in CENTRAL COOK COUNTY, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Storm in SOUTHERN COOK COUNTY, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in KENDALL, ILLINOIS
From 30-JAN-21 15:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in GRUNDY, ILLINOIS
From 30-JAN-21 13:30:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in LA SALLE, ILLINOIS
From 30-JAN-21 14:30:00 to 31-JAN-21 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in KANKAKEE, ILLINOIS
From 30-JAN-21 14:30:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in IROQUOIS, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in EASTERN WILL COUNTY, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in SOUTHERN WILL COUNTY, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in NORTHERN WILL COUNTY, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in LIVINGSTON, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in FORD, ILLINOIS
From 30-JAN-21 14:00:00 to 31-JAN-21 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter