For 2013 in Illinois, here are the graphs of monthly temperature and precipitation departures from the 1981-2010 average, through the end of June. In terms of temperature, the two standout months were the mild January and the chilly March. For precipitation, all but March have had above-average precipitation. These are statewide numbers so your experience may differ from this.
One situation we have run into is that several sites have received more precipitation in the first six months of 2013 than they did in all 12 months of 2012. For example,
Havana received 25.49 inches in 2012, and 35.35 inches in the first half of 2013.
Quincy received 24.56 inches in 2012, and 27.30 inches in the first half of 2013.
Peoria received 27.08 inches in 2012, and 29.71 inches in the first half of 2013.
Moline received 27.25 inches in 2012, and 29.29 inches in the first half of 2013.
Rockford received 23.35 inches in 2012, and 27.16 inches in the first half of 2013.
Chicago received 26.91 inches in 2012, and 28.46 inches in the first half of 2013.
Based on preliminary numbers, the statewide average precipitation for June 2013 in Illinois was 5.19 inches. That was 0.99 inches above the 1981-2010 average. It was more than double the June 2012 total of 1.80 inches.
In the first map below, the two wettest areas in Illinois were in northern Illinois and an area just to the south of Interstate 70. The area in northern Illinois was part of a larger area of heavy amounts in northeastern Iowa and southern Wisconsin. The area in southern Illinois extended into southern Indiana and Kentucky. Both regions had rainfall totals in excess of 8 inches and even 10 or more inches in the red and purple areas.
By contrast, much of the rest of the state was close to average precipitation for June with 3 to 6 inches very common (shades of green on the map). The few areas in blue (representing less than 3 inches) in western and north central Illinois are not alarming yet because they followed a wet spring. In fact, much of the Midwest experienced a wet June, including the Ohio River Valley which experienced drier conditions early in the month.
The second map zooms in on Illinois and shows the departures from average for June. The wet areas in northern and south-central Illinois stand out with rainfall totals 3 to 5 inches above average. Areas in central and southwestern Illinois were below average.
The year to date (January-June) statewide precipitation for Illinois was 28.74. That was 8.91 inches above the 1981-2010 average and the wettest January-June on record. The statewide records go back to 1895. It is more than double the 12.67 inches accumulate in January-June of 2012 during the height of the drought.
The statewide average temperature was 71.5 degrees, which was 0.3 degrees below the 1981-2010 average.
Wettest Locations In Illinois in June
Location and June precipitation total in inches, ranked high to low. List cut off for sites with less than 5 inches to keep the list somewhat short.