January total precipitation (left) and departure from normal (right). Preliminary statewide average total January precipitation was 2.56 inches, 0.49 inches above the 1981–2010 normal and tied for the 32 nd wettest on record going back to 1895. Overall, total January precipitation ranged from nearly 6 inches in far southern Illinois to just under 2 inches in northwest Illinois, wetter than the 1981–2010 normal virtually everywhere in the state (Figure 5). January snowfall total (left), departure from normal (middle), and total season snowfall as a percent of normal (right). Total snowfall is 10 to 50 percent of average in southern and central Illinois and above average only in northwest and far northern Illinois. Most folks south of Interstate 80 have seen below average snowfall for the winter season to date. January total snowfall ranged from less than half an inch in southern Illinois to over 20 inches in northern Illinois. The late-month snow helped boost January totals above the 1981–2010 normal across most of northern and north-central Illinois, while the southern two-thirds of the state were within 2 inches of normal (Figure 4). Total snowfall (inches) between January 30 and 31. Chicago’s O’Hare Airport reported 10.8 inches, which was the 26 th largest two-day snowfall total on record there and the largest since 2015. The National Weather Service Chicago office reported isolated totals of over 12 inches in Romeoville, Peotone, and Thornton. The map below shows snowfall totals on January 30–31 ranged from less than a tenth of an inch in south-central Illinois to over 10 inches in the Chicagoland area. However, the last week of January brought more active winter weather, including multiple large winter storms that produced heavy precipitation and impressive snow totals across the state. Last month started with rain and snow for most of the state, followed by two weeks when most of the state received less than half an inch of total precipitation. The preliminary statewide average January temperature was 28.8 degrees, 2.4 degrees above the 1981–2010 normal and the 36 th warmest on record going back to 1895.Ĭlimatologically, January is one of the drier months of the year in Illinois. January average temperature (left) and departure from the 1981-2010 normal (right). As the maps below show, January average temperatures ranged from the mid-20s in northern Illinois to the high 30s in southern Illinois, which was between 3 and 5 degrees above the 1981–2010 normal (Figure 2). This was the daily high minimum temperature record in Rockford. Daily temperature in Peoria, expressed as a departure from the long-term average.ĭespite the consistency of warmer than average conditions last month, only one daily temperature record was broken. For example, Marengo in McHenry County has accumulated just over 3,600 heating degree days in the winter season to date, compared to a 30-year normal of 4,100 by this time. The lack of very cold days and nights this winter season has resulted in below average heating degree days, a metric often used to estimate and predict energy demand for heating. Only 7 out of 31 January days were cooler than average in Peoria. Figure 1 (below) shows January daily average temperature as a departure from average in Peoria. Preliminary statewide average total January precipitation was 2.56 inches, 0.49 inches above the 1981–2010 normal and tied for the 32 nd wettest on record going back to 1895.ĭata are provisional and may change slightly over timeįollowing a warmer than average December, temperatures remained persistently above average throughout January. The preliminary statewide average January temperature was 28.8 degrees, 2.4 degrees above the 1981–2010 normal and tied for the 36 th warmest on record going back to 1895. Lynwood has received 10 inches.Īt Chicago's Midway Airport, 9.5 inches were reported as of noon, with O'Hare reporting five inches of snow.Įlsewhere, Coal City has reported 10.5 inches of snow, while Kankakee has seen nine inches fall as of 3 p.m.Our first month of 2021 was quite a bit warmer and slightly wetter than average across the state. In Cook County, Midlothian has reported 10.8 inches of snow during the storm, with 10.5 inches falling in both Tinley Park and Oak Lawn, according to officials. Downers Grove family mourns after dog killed by coyotes
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