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
| # | County | Heat Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Milwaukee County | High | 3.11 / yr | $25M | |
| 2 | Dane County | Medium | 3.53 / yr | $8M | |
| 3 | Juneau County | Medium | 3.05 / yr | $5M | |
| 4 | Waukesha County | Medium | 3.21 / yr | $6M | |
| 5 | La Crosse County | Medium | 3.68 / yr | $3M | |
| 6 | Racine County | Medium | 3.21 / yr | $2M | |
| 7 | Rock County | Medium | 3.63 / yr | $2M | |
| 8 | Kenosha County | Medium | 3.21 / yr | $2M | |
| 9 | Columbia County | Medium | 2.79 / yr | $2M | |
| 10 | Manitowoc County | Medium | 1.05 / yr | $2M | |
| 11 | Barron County | Low | 1.58 / yr | $1M | |
| 12 | Monroe County | Low | 3.53 / yr | $939K | |
| 13 | Brown County | Low | 1.53 / yr | $1M | |
| 14 | Crawford County | Low | 4.16 / yr | $1M | |
| 15 | Winnebago County | Low | 1.63 / yr | $1M | |
| 16 | Walworth County | Low | 3.58 / yr | $1M | |
| 17 | Dodge County | Low | 2.95 / yr | $1M | |
| 18 | Adams County | Low | 3.00 / yr | $678K | |
| 19 | Washington County | Low | 2.74 / yr | $2M | |
| 20 | Fond du Lac County | Low | 2.53 / yr | $1M | |
| 21 | Jefferson County | Low | 3.42 / yr | $1M | |
| 22 | Outagamie County | Low | 1.53 / yr | $1M | |
| 23 | Sheboygan County | Low | 2.11 / yr | $1M | |
| 24 | Sauk County | Low | 3.26 / yr | $939K | |
| 25 | Eau Claire County | Low | 2.79 / yr | $987K | |
| 26 | Vernon County | Low | 3.63 / yr | $587K | |
| 27 | Richland County | Low | 3.74 / yr | $587K | |
| 28 | Grant County | Low | 4.26 / yr | $628K | |
| 29 | Marathon County | Low | 1.37 / yr | $745K | |
| 30 | Marquette County | Low | 2.63 / yr | $587K | |
| 31 | Douglas County | Low | 1.11 / yr | $681K | |
| 32 | Trempealeau County | Low | 3.37 / yr | $587K | |
| 33 | Polk County | Low | 2.00 / yr | $571K | |
| 34 | Clark County | Low | 2.00 / yr | $347K | |
| 35 | Ozaukee County | Low | 2.21 / yr | $994K | |
| 36 | Green Lake County | Low | 2.68 / yr | $336K | |
| 37 | Dunn County | Low | 2.89 / yr | $662K | |
| 38 | Waupaca County | Low | 1.53 / yr | $414K | |
| 39 | Chippewa County | Low | 2.37 / yr | $555K | |
| 40 | Jackson County | Low | 3.26 / yr | $369K | |
| 41 | Green County | Low | 3.74 / yr | $509K | |
| 42 | Wood County | Low | 1.42 / yr | $406K | |
| 43 | St. Croix County | Low | 3.16 / yr | $540K | |
| 44 | Calumet County | Low | 1.58 / yr | $587K | |
| 45 | Waushara County | Low | 1.68 / yr | $291K | |
| 46 | Iowa County | Low | 3.68 / yr | $367K | |
| 47 | Portage County | Low | 1.42 / yr | $414K | |
| 48 | Shawano County | Low | 1.42 / yr | $284K | |
| 49 | Burnett County | Very Low | 1.63 / yr | $156K | |
| 50 | Lafayette County | Very Low | 3.74 / yr | $237K | |
| 51 | Pierce County | Very Low | 3.63 / yr | $256K | |
| 52 | Sawyer County | Very Low | 1.37 / yr | $114K | |
| 53 | Washburn County | Very Low | 1.42 / yr | $153K | |
| 54 | Taylor County | Very Low | 1.47 / yr | $140K | |
| 55 | Bayfield County | Very Low | 1.05 / yr | $121K | |
| 56 | Buffalo County | Very Low | 3.42 / yr | $160K | |
| 57 | Rusk County | Very Low | 1.63 / yr | $112K | |
| 58 | Oconto County | Very Low | 0.83 / yr | $122K | |
| 59 | Marinette County | Very Low | 0.55 / yr | $86K | |
| 60 | Ashland County | Very Low | 1.05 / yr | $70K | |
| 61 | Pepin County | Very Low | 3.37 / yr | $83K | |
| 62 | Price County | Very Low | 1.21 / yr | $58K | |
| 63 | Kewaunee County | Very Low | 0.95 / yr | $76K | |
| 64 | Lincoln County | Very Low | 0.53 / yr | $60K | |
| 65 | Langlade County | Very Low | 0.42 / yr | $39K | |
| 66 | Oneida County | Very Low | 0.32 / yr | $37K | |
| 67 | Menominee County | Very Low | 1.16 / yr | $22K | |
| 68 | Vilas County | Very Low | 0.32 / yr | $22K | |
| 69 | Iron County | Very Low | 0.79 / yr | $17K | |
| 70 | Door County | Very Low | 0.16 / yr | $16K | |
| 71 | Forest County | Very Low | 0.32 / yr | $9K | |
| 72 | Florence County | 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.