Ranked from NOAA 1991-2020 Climate Normals
Hottest Summers in Illinois
Average daily high in the hottest month of the year, by county. Read it next to the cooling degree days in the same row: the two together are what the summer electricity bill is actually made of. Figures are NOAA 1991-2020 Climate Normals from the weather station nearest each county seat, so they describe a thirty-year average rather than any single year.
Where does yours land?
Every county in America is somewhere on this scale, including the one you live in.
Illinois ranked
| # | County | Summer high | Cooling degree days | Monthly to own |
|---|---|---|---|---|
| 1 | Bond County | 90.2°F | 1,579 | $1,292 |
| 2 | Madison County | 90.2°F | 1,579 | $1,573 |
| 3 | St. Clair County | 90.2°F | 1,579 | $1,604 |
| 4 | Massac County | 89.9°F | 1,683 | $1,123 |
| 5 | Union County | 89.7°F | 1,634 | $1,220 |
| 6 | Edwards County | 89.6°F | 1,546 | $960 |
| 7 | Wayne County | 89.6°F | 1,546 | $1,058 |
| 8 | Alexander County | 89.2°F | 1,566 | $667 |
| 9 | Hamilton County | 89.2°F | 1,306 | $1,038 |
| 10 | Saline County | 89.1°F | 1,522 | $931 |
| 11 | Clay County | 89.0°F | 1,337 | $947 |
| 12 | Monroe County | 89.0°F | 1,476 | $2,321 |
| 13 | Pulaski County | 89.0°F | 1,546 | $789 |
| 14 | Montgomery County | 88.7°F | 1,389 | $1,018 |
| 15 | Effingham County | 88.5°F | 1,298 | $1,607 |
| 16 | Franklin County | 88.4°F | 1,370 | $887 |
| 17 | Jackson County | 88.4°F | 1,370 | $1,220 |
| 18 | Perry County | 88.4°F | 1,370 | $1,037 |
| 19 | Williamson County | 88.4°F | 1,370 | $1,364 |
| 20 | Clinton County | 88.3°F | 1,438 | $1,666 |
| 21 | Johnson County | 88.3°F | 1,389 | $1,337 |
| 22 | Lawrence County | 88.3°F | 1,291 | $924 |
| 23 | Pope County | 88.3°F | 1,389 | $1,427 |
| 24 | Gallatin County | 88.2°F | 1,437 | $863 |
| 25 | Fulton County | 88.1°F | 1,161 | $1,056 |
| 26 | Mason County | 88.1°F | 1,161 | $1,087 |
| 27 | Marion County | 87.8°F | 1,328 | $1,001 |
| 28 | Clark County | 87.7°F | 1,228 | $1,182 |
| 29 | Randolph County | 87.7°F | 1,244 | $1,238 |
| 30 | White County | 87.6°F | 1,245 | $974 |
| 31 | Ford County | 87.5°F | 1,145 | $1,180 |
| 32 | Pike County | 87.5°F | 1,252 | $988 |
| 33 | Crawford County | 87.4°F | 1,249 | $1,095 |
| 34 | Wabash County | 87.4°F | 1,459 | $1,011 |
| 35 | Brown County | 87.3°F | 1,169 | $1,309 |
| 36 | Washington County | 87.2°F | 1,304 | $1,415 |
| 37 | Marshall County | 87.0°F | 1,134 | $1,334 |
| 38 | Calhoun County | 86.8°F | 1,159 | $1,557 |
| 39 | Cass County | 86.8°F | 1,252 | $995 |
| 40 | Richland County | 86.8°F | 1,195 | $1,036 |
| 41 | Scott County | 86.8°F | 1,131 | $986 |
| 42 | Fayette County | 86.7°F | 1,274 | $1,099 |
| 43 | Jersey County | 86.5°F | 1,152 | $1,556 |
| 44 | Morgan County | 86.5°F | 1,067 | $1,248 |
| 45 | Christian County | 86.4°F | 1,206 | $1,095 |
| 46 | Hardin County | 86.4°F | 1,131 | $893 |
| 47 | Jasper County | 86.4°F | 1,234 | $1,203 |
| 48 | Hancock County | 86.3°F | 1,170 | $1,081 |
| 49 | Peoria County | 86.3°F | 1,157 | $1,488 |
| 50 | Tazewell County | 86.3°F | 1,157 | $1,571 |
| 51 | Macoupin County | 86.2°F | 1,142 | $1,195 |
| 52 | Rock Island County | 86.1°F | 1,041 | $1,432 |
| 53 | Adams County | 86.0°F | 1,153 | $1,430 |
| 54 | McLean County | 86.0°F | 978 | $1,878 |
| 55 | Moultrie County | 86.0°F | 1,128 | $1,192 |
| 56 | Shelby County | 86.0°F | 1,186 | $1,220 |
| 57 | De Witt County | 85.8°F | 1,105 | $1,208 |
| 58 | Henry County | 85.7°F | 1,031 | $1,395 |
| 59 | Jefferson County | 85.7°F | 1,191 | $1,147 |
| 60 | McDonough County | 85.7°F | 1,017 | $1,067 |
| 61 | Coles County | 85.6°F | 1,116 | $1,209 |
| 62 | Cumberland County | 85.6°F | 1,116 | $1,146 |
| 63 | Greene County | 85.6°F | 1,107 | $951 |
| 64 | Logan County | 85.5°F | 1,014 | $1,220 |
| 65 | Menard County | 85.5°F | 1,056 | $1,623 |
| 66 | Sangamon County | 85.5°F | 1,094 | $1,600 |
| 67 | Woodford County | 85.5°F | 1,067 | $1,825 |
| 68 | Vermilion County | 85.4°F | 1,066 | $950 |
| 69 | Henderson County | 85.2°F | 1,083 | $1,010 |
| 70 | Champaign County | 85.0°F | 1,054 | $1,901 |
| 71 | Carroll County | 84.9°F | 746 | $1,138 |
| 72 | Douglas County | 84.9°F | 1,076 | $1,353 |
| 73 | Grundy County | 84.9°F | 995 | $2,341 |
| 74 | Iroquois County | 84.8°F | 892 | $1,228 |
| 75 | Kankakee County | 84.8°F | 997 | $1,764 |
| 76 | Macon County | 84.7°F | 1,116 | $1,214 |
| 77 | Mercer County | 84.7°F | 885 | $1,341 |
| 78 | Bureau County | 84.5°F | 860 | $1,211 |
| 79 | Putnam County | 84.5°F | 946 | $1,525 |
| 80 | Schuyler County | 84.5°F | 987 | $1,060 |
| 81 | DuPage County | 84.4°F | 775 | $3,309 |
| 82 | Edgar County | 84.4°F | 928 | $952 |
| 83 | Kendall County | 84.4°F | 781 | $2,793 |
| 84 | Livingston County | 84.3°F | 1,052 | $1,303 |
| 85 | Warren County | 84.1°F | 891 | $1,026 |
| 86 | Cook County | 84.0°F | 822 | $2,709 |
| 87 | Kane County | 84.0°F | 822 | $2,792 |
| 88 | McHenry County | 84.0°F | 771 | $2,680 |
| 89 | Boone County | 83.9°F | 839 | $1,880 |
| 90 | Lee County | 83.9°F | 839 | $1,467 |
| 91 | Ogle County | 83.9°F | 839 | $1,721 |
| 92 | Winnebago County | 83.9°F | 839 | $1,540 |
| 93 | Stark County | 83.7°F | 829 | $1,022 |
| 94 | Knox County | 83.6°F | 899 | $1,060 |
| 95 | Piatt County | 83.6°F | 822 | $1,591 |
| 96 | Will County | 83.6°F | 872 | $2,740 |
| 97 | Lake County | 83.5°F | 806 | $3,073 |
| 98 | Jo Daviess County | 83.3°F | 677 | $1,756 |
| 99 | DeKalb County | 83.1°F | 790 | $2,214 |
| 100 | Whiteside County | 83.1°F | 705 | $1,250 |
| 101 | LaSalle County | 82.9°F | 865 | $1,496 |
| 102 | Stephenson County | 82.4°F | 690 | $1,300 |
Every figure is modelled on the county's own median home with 20% down at 7.03%. Property tax and electricity are county and state specific; homeowners insurance uses the NAIC average premium for that state, which ranges from 0.16% of home value in Hawaii to 1.16% in Oklahoma. Maintenance and water are national estimates. Full methodology.
Nationwide
Hottest Summers across all 3,133 US counties · Every county in Illinois