Oppressive dew point values in the lower 80s on Sunday, July 24, resulted in extreme levels of heat index across much of central and southeast Illinois. Here are some of the highest values reported in our area. Formal records of heat index are not kept, as this is a calculated item (based on temperature and relative humidity), rather than something that is directly measured with a weather instrument.
| Location | Heat Index | Time |
| Lincoln (Logan Co. Airport) | 121 | 5:55 pm |
| Bondville | 119 | 5:00 pm |
| Jacksonville Municipal Airport | 116 | 4:15 pm |
| East Peoria | 116 | 5:30 pm |
| Peoria Int'l Airport | 116 | 4:54 pm |
| Springfield (Abraham Lincoln Capital Airport) | 115 | 3:52 pm |
| Flora (airport) | 114 | 3:35 pm |
| Taylorville (airport) | 113 | 4:15 pm |
| Lacon (Marshall Co. Airport) | 112 | 4:15 pm |
| Decatur Airport | 112 | 3:54 pm |
| Galesburg Municipal Airport | 111 | 3:15 pm |
| Effingham (airport) | 111 | 4:55 pm |
| Danville (Vermilion Regional Airport) | 111 | 3:35 pm |
| Bloomington (Central Illinois Regional Airport) | 110 | 12:50 pm |
| Paris (Edgar Co. Airport) | 109 | 4:15 pm |
| Olney-Noble Airport | 109 | 5:35 pm |
| Rantoul (airport) | 108 | 1:35 pm |
| Robinson (Crawford Co. Airport) | 108 | 5:15 pm |
| Lawrenceville-Vincennes Int'l Airport | 108 | 4:53 pm |
| Mount Carmel (airport) | 108 | 3:35 pm |
| Champaign (Willard Airport) | 105 | 2:53 pm |
| Mattoon (Coles Co. Airport) | 102 | 5:53 pm |
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