Heat Wave Risk in Illinois

All Illinois counties ranked by FEMA National Risk Index heat wave score

Heat Wave risk — prolonged periods of extreme heat that threaten health and infrastructure — is rated for 102 of 102 Illinois counties in FEMA's National Risk Index. Cook County carries the state's highest heat wave score at 99.8, with $193M in expected annual heat wave losses.

3 Illinois counties are rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $359M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Heat Wave

#CountyHeat Wave ScoreRatingAnn. Freq.Ann. Loss
1 Cook County
99.8
Very High 2.90 / yr $193M
2 St. Clair County
98.1
High 14.79 / yr $15M
3 Madison County
98.0
High 14.74 / yr $17M
4 Sangamon County
96.2
Medium 8.26 / yr $8M
5 Will County
95.5
Medium 3.64 / yr $9M
6 Rock Island County
93.4
Medium 7.21 / yr $4M
7 DuPage County
93.3
Medium 3.12 / yr $6M
8 Peoria County
92.9
Medium 6.53 / yr $4M
9 Lake County
92.5
Medium 2.50 / yr $5M
10 Macoupin County
91.5
Medium 9.42 / yr $3M
11 Adams County
91.2
Medium 8.42 / yr $4M
12 Jackson County
90.7
Medium 10.58 / yr $2M
13 Williamson County
90.7
Medium 10.37 / yr $3M
14 Macon County
90.3
Medium 7.32 / yr $3M
15 Washington County
90.2
Medium 11.16 / yr $3M
16 Kane County
90.0
Medium 3.17 / yr $4M
17 Randolph County
89.2
Medium 11.37 / yr $3M
18 Champaign County
89.1
Medium 6.47 / yr $3M
19 Monroe County
87.6
Medium 13.21 / yr $4M
20 Franklin County
87.4
Medium 10.11 / yr $2M
21 Wayne County
86.4
Medium 9.11 / yr $2M
22 Tazewell County
86.1
Medium 6.58 / yr $3M
23 Winnebago County
85.3
Medium 3.26 / yr $2M
24 McLean County
85.2
Medium 6.26 / yr $3M
25 Union County
84.1
Medium 10.63 / yr $2M
26 Morgan County
83.4
Medium 8.37 / yr $2M
27 Marion County
83.3
Medium 10.53 / yr $2M
28 McDonough County
82.2
Medium 9.00 / yr $1M
29 Jefferson County
81.3
Medium 9.89 / yr $1M
30 Hancock County
80.4
Medium 9.16 / yr $1M
31 Knox County
80.3
Medium 6.42 / yr $1M
32 Montgomery County
79.4
Medium 9.42 / yr $1M
33 Jersey County
79.3
Medium 11.10 / yr $2M
34 Vermilion County
79.1
Medium 6.42 / yr $1M
35 Perry County
78.9
Medium 10.26 / yr $1M
36 Saline County
78.5
Low 9.68 / yr $992K
37 Kankakee County
77.7
Low 4.42 / yr $1M
38 Clinton County
77.2
Low 10.95 / yr $1M
39 Pike County
77.2
Low 9.21 / yr $1M
40 Fulton County
76.7
Low 6.95 / yr $1M
41 McHenry County
75.5
Low 2.79 / yr $2M
42 Logan County
75.0
Low 7.68 / yr $1M
43 Massac County
72.8
Low 10.58 / yr $858K
44 Gallatin County
71.6
Low 9.53 / yr $624K
45 Fayette County
70.9
Low 9.95 / yr $920K
46 Coles County
70.7
Low 7.21 / yr $1M
47 Henry County
70.2
Low 7.00 / yr $1M
48 LaSalle County
69.7
Low 4.37 / yr $909K
49 Johnson County
68.9
Low 10.47 / yr $623K
50 Christian County
68.2
Low 7.95 / yr $1M
51 Effingham County
66.9
Low 7.95 / yr $907K
52 Bond County
66.0
Low 10.32 / yr $745K
53 Warren County
65.8
Low 8.84 / yr $864K
54 White County
65.7
Low 9.32 / yr $624K
55 Cass County
64.8
Low 8.21 / yr $731K
56 Richland County
64.1
Low 8.00 / yr $587K
57 Stephenson County
63.7
Low 4.74 / yr $610K
58 Brown County
62.6
Low 8.37 / yr $686K
59 Clay County
62.1
Low 8.05 / yr $587K
60 Kendall County
61.9
Low 3.53 / yr $1M
61 Greene County
61.8
Low 9.58 / yr $686K
62 Menard County
60.1
Low 8.05 / yr $495K
63 Calhoun County
59.6
Low 11.37 / yr $686K
64 Edgar County
59.4
Low 6.84 / yr $590K
65 DeKalb County
59.0
Low 3.42 / yr $600K
66 Mason County
57.4
Low 7.11 / yr $473K
67 Lawrence County
57.3
Low 8.00 / yr $451K
68 Shelby County
56.3
Low 7.74 / yr $584K
69 Moultrie County
55.8
Low 7.32 / yr $357K
70 Crawford County
55.4
Low 7.89 / yr $587K
71 Schuyler County
55.1
Low 7.42 / yr $376K
72 Wabash County
54.5
Low 9.11 / yr $418K
73 Douglas County
53.5
Low 6.95 / yr $384K
74 Clark County
52.8
Low 7.53 / yr $418K
75 Henderson County
52.2
Low 9.00 / yr $307K
76 Pulaski County
50.6
Low 11.16 / yr $265K
77 Whiteside County
50.2
Low 5.89 / yr $368K
78 Alexander County
50.2
Low 11.16 / yr $257K
79 Woodford County
49.4
Low 6.53 / yr $634K
80 Livingston County
49.1
Low 5.00 / yr $385K
81 Edwards County
49.0
Low 9.11 / yr $255K
82 Jo Daviess County
48.7
Low 4.74 / yr $330K
83 Mercer County
48.5
Low 8.16 / yr $551K
84 Bureau County
48.2
Low 6.53 / yr $339K
85 De Witt County
48.1
Low 6.79 / yr $343K
86 Boone County
46.8
Low 3.00 / yr $350K
87 Grundy County
45.9
Low 4.32 / yr $592K
88 Hamilton County
44.1
Low 9.32 / yr $345K
89 Iroquois County
44.0
Low 4.74 / yr $289K
90 Cumberland County
43.9
Low 7.58 / yr $236K
91 Piatt County
42.5
Low 6.63 / yr $292K
92 Ogle County
41.7
Low 3.58 / yr $304K
93 Jasper County
37.2
Very Low 7.89 / yr $272K
94 Carroll County
36.0
Very Low 5.05 / yr $168K
95 Scott County
35.1
Very Low 8.37 / yr $277K
96 Marshall County
34.8
Very Low 6.42 / yr $169K
97 Hardin County
34.5
Very Low 9.47 / yr $147K
98 Pope County
34.0
Very Low 9.68 / yr $154K
99 Lee County
31.9
Very Low 3.74 / yr $172K
100 Ford County
31.3
Very Low 4.84 / yr $148K
101 Stark County
22.6
Very Low 6.37 / yr $92K
102 Putnam County
19.4
Very Low 6.53 / yr $61K

102 Illinois counties with measurable heat wave risk. See the national heat wave ranking or all Illinois counties by overall risk.

Frequently Asked Questions

Which Illinois county has the highest heat wave risk?

Cook County has the highest FEMA heat wave risk score in Illinois at 99.8 (Very High), with $193M in expected annual losses and about 2.90 events per year.

How many Illinois counties face significant heat wave risk?

102 Illinois counties record measurable heat wave risk in FEMA's National Risk Index; 3 of them are rated High or Very High.

Other Hazards in Illinois

Cold Wave Drought Earthquake Hail Hurricane Ice Storm Riverine Flood Landslide Lightning Strong Wind Tornado Wildfire Winter Weather