Heat Wave Risk in Wisconsin

All Wisconsin 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 72 of 72 Wisconsin counties in FEMA's National Risk Index. Milwaukee County carries the state's highest heat wave score at 99.0, with $25M in expected annual heat wave losses.

1 Wisconsin county is rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $89M 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 Milwaukee County
99.0
High 3.11 / yr $25M
2 Dane County
95.3
Medium 3.53 / yr $8M
3 Juneau County
95.1
Medium 3.05 / yr $5M
4 Waukesha County
90.4
Medium 3.21 / yr $6M
5 La Crosse County
88.5
Medium 3.68 / yr $3M
6 Racine County
83.0
Medium 3.21 / yr $2M
7 Rock County
80.8
Medium 3.63 / yr $2M
8 Kenosha County
80.4
Medium 3.21 / yr $2M
9 Columbia County
80.4
Medium 2.79 / yr $2M
10 Manitowoc County
79.9
Medium 1.05 / yr $2M
11 Barron County
76.3
Low 1.58 / yr $1M
12 Monroe County
76.1
Low 3.53 / yr $939K
13 Brown County
76.0
Low 1.53 / yr $1M
14 Crawford County
75.8
Low 4.16 / yr $1M
15 Winnebago County
75.0
Low 1.63 / yr $1M
16 Walworth County
74.0
Low 3.58 / yr $1M
17 Dodge County
72.7
Low 2.95 / yr $1M
18 Adams County
72.4
Low 3.00 / yr $678K
19 Washington County
72.0
Low 2.74 / yr $2M
20 Fond du Lac County
71.4
Low 2.53 / yr $1M
21 Jefferson County
71.3
Low 3.42 / yr $1M
22 Outagamie County
71.1
Low 1.53 / yr $1M
23 Sheboygan County
68.0
Low 2.11 / yr $1M
24 Sauk County
67.5
Low 3.26 / yr $939K
25 Eau Claire County
67.4
Low 2.79 / yr $987K
26 Vernon County
66.9
Low 3.63 / yr $587K
27 Richland County
65.2
Low 3.74 / yr $587K
28 Grant County
63.0
Low 4.26 / yr $628K
29 Marathon County
62.8
Low 1.37 / yr $745K
30 Marquette County
62.7
Low 2.63 / yr $587K
31 Douglas County
61.4
Low 1.11 / yr $681K
32 Trempealeau County
60.6
Low 3.37 / yr $587K
33 Polk County
60.1
Low 2.00 / yr $571K
34 Clark County
58.3
Low 2.00 / yr $347K
35 Ozaukee County
56.0
Low 2.21 / yr $994K
36 Green Lake County
54.9
Low 2.68 / yr $336K
37 Dunn County
54.8
Low 2.89 / yr $662K
38 Waupaca County
54.6
Low 1.53 / yr $414K
39 Chippewa County
54.6
Low 2.37 / yr $555K
40 Jackson County
53.4
Low 3.26 / yr $369K
41 Green County
52.3
Low 3.74 / yr $509K
42 Wood County
49.6
Low 1.42 / yr $406K
43 St. Croix County
48.9
Low 3.16 / yr $540K
44 Calumet County
46.2
Low 1.58 / yr $587K
45 Waushara County
44.2
Low 1.68 / yr $291K
46 Iowa County
43.8
Low 3.68 / yr $367K
47 Portage County
43.1
Low 1.42 / yr $414K
48 Shawano County
41.8
Low 1.42 / yr $284K
49 Burnett County
38.6
Very Low 1.63 / yr $156K
50 Lafayette County
38.4
Very Low 3.74 / yr $237K
51 Pierce County
35.4
Very Low 3.63 / yr $256K
52 Sawyer County
33.2
Very Low 1.37 / yr $114K
53 Washburn County
32.6
Very Low 1.42 / yr $153K
54 Taylor County
31.4
Very Low 1.47 / yr $140K
55 Bayfield County
31.3
Very Low 1.05 / yr $121K
56 Buffalo County
30.0
Very Low 3.42 / yr $160K
57 Rusk County
28.9
Very Low 1.63 / yr $112K
58 Oconto County
28.2
Very Low 0.83 / yr $122K
59 Marinette County
23.8
Very Low 0.55 / yr $86K
60 Ashland County
23.2
Very Low 1.05 / yr $70K
61 Pepin County
22.9
Very Low 3.37 / yr $83K
62 Price County
20.6
Very Low 1.21 / yr $58K
63 Kewaunee County
19.6
Very Low 0.95 / yr $76K
64 Lincoln County
18.6
Very Low 0.53 / yr $60K
65 Langlade County
16.0
Very Low 0.42 / yr $39K
66 Oneida County
14.8
Very Low 0.32 / yr $37K
67 Menominee County
14.6
Very Low 1.16 / yr $22K
68 Vilas County
12.7
Very Low 0.32 / yr $22K
69 Iron County
11.4
Very Low 0.79 / yr $17K
70 Door County
9.5
Very Low 0.16 / yr $16K
71 Forest County
7.5
Very Low 0.32 / yr $9K
72 Florence County
4.7
Very Low 0.37 / yr $5K

72 Wisconsin counties with measurable heat wave risk. See the national heat wave ranking or all Wisconsin counties by overall risk.

Frequently Asked Questions

Which Wisconsin county has the highest heat wave risk?

Milwaukee County has the highest FEMA heat wave risk score in Wisconsin at 99.0 (High), with $25M in expected annual losses and about 3.11 events per year.

How many Wisconsin counties face significant heat wave risk?

72 Wisconsin counties record measurable heat wave risk in FEMA's National Risk Index; 1 of them are rated High or Very High.

Other Hazards in Wisconsin