Illinois State Water Survey Illinois State Climatologist

100 Degree Mark in Illinois

Based on preliminary reports, Geneseo and Bentley Illinois reached 101°F yesterday. Another nine places reached 100°F. They include Illinois City, Moline, Mt. Carroll, Rockford, Prairie City, Normal, Rantoul, Streator, and Urbana. The Chicago Botanical Garden was close with 99°F. Here is the list with the last time they saw 100°F: Geneseo: July 25, 2005 Bentley: […]

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100 Degree Mark in Illinois

Based on preliminary reports, Geneseo and Bentley Illinois reached 101°F yesterday. Another nine places reached 100°F. They include Illinois City, Moline, Mt. Carroll, Rockford, Prairie City, Normal, Rantoul, Streator, and Urbana. The Chicago Botanical Garden was close with 99°F. Here is the list with the last time they saw 100°F: Geneseo: July 25, 2005 Bentley: […]

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Heat Index Extremes for Illinois

Since heat and humidity is on everyone’s mind these days, I pulled out the record high heat index values that we calculated for the Illinois Climate Atlas from a few years ago. For that analysis we looked at the few sites with long-term temperature and humidity records. Here is what we found for the highest […]

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