Lightning Risk in Wisconsin

All Wisconsin counties ranked by FEMA National Risk Index lightning score

Lightning risk — electrical discharges from storms that ignite fires and cause casualties — is rated for 72 of 72 Wisconsin counties in FEMA's National Risk Index. Marathon County carries the state's highest lightning score at 95.2, with $2M in expected annual lightning losses.

10 Wisconsin counties are rated High or Very High for lightning, and expected annual losses from lightning total roughly $37M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Lightning

#CountyLightning ScoreRatingAnn. Freq.Ann. Loss
1 Marathon County
95.2
High 31.86 / yr $2M
2 Brown County
95.0
High 30.87 / yr $2M
3 Kenosha County
92.9
High 35.18 / yr $2M
4 Outagamie County
90.5
High 31.69 / yr $2M
5 Dane County
90.4
High 37.12 / yr $2M
6 Oconto County
86.5
High 29.89 / yr $1M
7 Rock County
84.7
High 38.50 / yr $1M
8 Racine County
83.3
High 35.44 / yr $957K
9 Winnebago County
82.9
High 34.17 / yr $989K
10 Marinette County
82.1
High 27.88 / yr $788K
11 Jefferson County
80.8
Medium 36.91 / yr $896K
12 Waupaca County
79.5
Medium 32.15 / yr $633K
13 Burnett County
78.8
Medium 31.91 / yr $501K
14 Shawano County
76.9
Medium 31.10 / yr $725K
15 Trempealeau County
76.3
Medium 35.43 / yr $621K
16 St. Croix County
76.0
Medium 34.86 / yr $943K
17 Oneida County
76.0
Medium 29.06 / yr $651K
18 Menominee County
75.7
Medium 30.29 / yr $395K
19 Walworth County
75.4
Medium 37.60 / yr $711K
20 Grant County
75.0
Medium 37.89 / yr $567K
21 Portage County
73.3
Medium 33.01 / yr $867K
22 Douglas County
73.2
Medium 29.46 / yr $611K
23 Langlade County
73.1
Medium 29.71 / yr $520K
24 Taylor County
72.5
Medium 32.30 / yr $519K
25 Clark County
71.7
Medium 33.15 / yr $340K
26 Polk County
71.1
Medium 33.37 / yr $513K
27 Eau Claire County
71.0
Medium 34.09 / yr $629K
28 Washburn County
70.6
Medium 31.80 / yr $499K
29 Chippewa County
69.4
Medium 33.45 / yr $585K
30 Barron County
67.0
Medium 33.39 / yr $423K
31 Vilas County
66.1
Medium 26.91 / yr $344K
32 Manitowoc County
65.7
Medium 30.51 / yr $489K
33 Wood County
65.1
Medium 32.95 / yr $461K
34 Dunn County
64.1
Medium 34.63 / yr $563K
35 Sheboygan County
63.1
Medium 31.51 / yr $474K
36 Lincoln County
63.0
Medium 30.78 / yr $420K
37 Fond du Lac County
62.3
Medium 34.30 / yr $449K
38 Bayfield County
61.8
Medium 27.26 / yr $297K
39 Milwaukee County
61.7
Medium 33.72 / yr $309K
40 Waukesha County
60.2
Medium 36.33 / yr $606K
41 Dodge County
59.4
Medium 34.87 / yr $391K
42 Washington County
59.4
Medium 33.91 / yr $577K
43 Sawyer County
57.9
Medium 31.21 / yr $218K
44 Ashland County
55.8
Low 27.90 / yr $242K
45 La Crosse County
55.2
Low 35.85 / yr $349K
46 Calumet County
54.3
Low 32.99 / yr $518K
47 Juneau County
53.1
Low 34.28 / yr $218K
48 Sauk County
52.7
Low 35.60 / yr $298K
49 Price County
52.5
Low 31.00 / yr $225K
50 Door County
48.3
Low 26.49 / yr $217K
51 Rusk County
47.7
Low 32.52 / yr $192K
52 Monroe County
47.6
Low 35.02 / yr $164K
53 Pierce County
46.5
Low 36.41 / yr $292K
54 Iron County
45.7
Low 27.69 / yr $149K
55 Jackson County
41.7
Low 34.34 / yr $145K
56 Ozaukee County
41.4
Low 32.08 / yr $344K
57 Kewaunee County
41.1
Low 29.40 / yr $214K
58 Forest County
40.6
Low 27.98 / yr $128K
59 Columbia County
37.2
Low 35.52 / yr $165K
60 Vernon County
32.7
Low 36.37 / yr $90K
61 Adams County
32.5
Low 33.48 / yr $80K
62 Green County
29.8
Low 38.37 / yr $130K
63 Green Lake County
27.8
Low 34.15 / yr $72K
64 Waushara County
27.8
Low 33.79 / yr $104K
65 Buffalo County
24.2
Low 36.35 / yr $100K
66 Crawford County
23.8
Very Low 37.48 / yr $81K
67 Richland County
22.8
Very Low 36.08 / yr $63K
68 Florence County
18.9
Very Low 27.32 / yr $63K
69 Marquette County
17.2
Very Low 34.00 / yr $53K
70 Iowa County
15.3
Very Low 37.58 / yr $69K
71 Lafayette County
14.9
Very Low 38.09 / yr $58K
72 Pepin County
14.2
Very Low 36.17 / yr $51K

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

Frequently Asked Questions

Which Wisconsin county has the highest lightning risk?

Marathon County has the highest FEMA lightning risk score in Wisconsin at 95.2 (High), with $2M in expected annual losses and about 31.86 events per year.

How many Wisconsin counties face significant lightning risk?

72 Wisconsin counties record measurable lightning risk in FEMA's National Risk Index; 10 of them are rated High or Very High.

Other Hazards in Wisconsin