Illinois State Water Survey Illinois State Climatologist

No Surprise – July was Hot and Dry for Illinois

July was one of the hottest and driest on record. So was the year to date. Here are how things stack up so far. How July Ranks This July was the second warmest and fourth driest on record in Illinois, based on preliminary numbers for the month. The statewide average temperature was 81.8 degrees, 6.4 […]

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July Rainfall in Illinois Varied from Too Dry to Too Wet

July 2011 rainfall in Illinois

The statewide average rainfall for July in Illinois was 4.12 inches, only 0.29 inches above average. However, rainfall across the state varied widely from too dry to too wet. Rainfall amounts in the northern third of the state were impressive with widespread areas in excess of 6 to 8 inches. The heaviest rains fell around […]

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Dangerous Heat and Humidity in Illinois

heat index chart

The National Weather Service (NWS) has issued a variety of heat warnings and advisories for Illinois this week. The combination of temperatures in the upper 90s and high levels of humidity mean a greater risk of heat-related illnesses and death. One measure that combines both the effects of temperature and humidity is the heat index. […]

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