The preliminary statewide average September temperature was 68.8 degrees, 2.0 degrees above the 1991–2020 average and tied for the 27th warmest on record going back to 1895. The preliminary statewide total September precipitation was 2.60 inches, 0.75 inches below the 1991–2020 average and the 41st driest on record. Data are provisional and may change slightly […]
Read More from Fall Begins with a Warm and Very Dry September
The first half of September in Illinois was warmer than average, about 3.5 degrees above average. Precipitation for the first half of September is mixed. A few areas east of St. Louis and along the eastern border with Indiana have seen 3 to 4 inches, which is well above average. Much of the rest of the […]
Read More from First Half of September in Illinois – Warmer than Average
Illinois and the rest of the Midwest are off to a hot start in September. As the map below shows, areas in shades of brown were up to 9 degrees above average. This includes southern Illinois and much of the southern states in the Midwest. The areas in pinks and red were even farther above […]
Highlights September was 1.5 degrees cooler than average and 0.88 inches wetter than average for Illinois. Year to date temperatures were 3.3 degrees below average and the 6th coolest January-September on record. The year to date precipitation was 32.91 inches, 2.5 inches above average. September The statewide average temperature for September in Illinois was 64.4 […]