Heat Wave Risk in Tennessee

All Tennessee 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 94 of 95 Tennessee counties in FEMA's National Risk Index. Shelby County carries the state's highest heat wave score at 99.6, with $49M in expected annual heat wave losses.

1 Tennessee county is rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $95M 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 Shelby County
99.6
High 21.74 / yr $49M
2 Davidson County
95.4
Medium 4.79 / yr $6M
3 Madison County
91.6
Medium 14.79 / yr $3M
4 Tipton County
90.3
Medium 19.00 / yr $2M
5 Montgomery County
84.3
Medium 5.58 / yr $2M
6 Dyer County
83.8
Medium 16.63 / yr $1M
7 Rutherford County
83.6
Medium 4.63 / yr $2M
8 Gibson County
82.6
Medium 13.79 / yr $1M
9 Fayette County
82.6
Medium 17.05 / yr $1M
10 Carroll County
82.5
Medium 11.58 / yr $1M
11 Obion County
81.7
Medium 14.95 / yr $1M
12 Lauderdale County
80.0
Medium 17.89 / yr $1M
13 Hamilton County
75.6
Low 1.84 / yr $1M
14 Henry County
74.5
Low 11.21 / yr $796K
15 Sumner County
74.2
Low 4.58 / yr $1M
16 Hardeman County
73.2
Low 15.42 / yr $676K
17 Knox County
72.6
Low 0.84 / yr $1M
18 Williamson County
72.5
Low 4.95 / yr $2M
19 Hardin County
71.2
Low 13.74 / yr $646K
20 Henderson County
69.9
Low 12.32 / yr $766K
21 Haywood County
69.6
Low 15.79 / yr $587K
22 Weakley County
68.6
Low 12.16 / yr $911K
23 McNairy County
67.0
Low 14.58 / yr $704K
24 Lake County
65.1
Low 15.53 / yr $463K
25 Robertson County
64.8
Low 4.74 / yr $811K
26 Wilson County
62.0
Low 4.53 / yr $906K
27 Maury County
60.9
Low 4.84 / yr $679K
28 Crockett County
59.1
Low 14.89 / yr $402K
29 Dickson County
56.6
Low 5.58 / yr $539K
30 Lawrence County
55.7
Low 5.42 / yr $382K
31 Chester County
55.5
Low 14.00 / yr $438K
32 Decatur County
52.9
Low 12.26 / yr $298K
33 Benton County
50.1
Low 7.79 / yr $297K
34 Lincoln County
50.0
Low 5.42 / yr $291K
35 Bedford County
48.0
Low 4.42 / yr $308K
36 Bradley County
46.3
Low 1.79 / yr $346K
37 Cheatham County
45.9
Low 4.89 / yr $359K
38 Giles County
45.0
Low 4.95 / yr $233K
39 Humphreys County
44.4
Low 5.79 / yr $231K
40 Hickman County
43.7
Low 5.79 / yr $232K
41 Macon County
43.5
Low 4.11 / yr $211K
42 Blount County
42.3
Low 0.65 / yr $286K
43 Franklin County
39.8
Low 3.89 / yr $229K
44 Stewart County
39.2
Low 5.63 / yr $158K
45 Wayne County
37.6
Very Low 5.63 / yr $143K
46 Coffee County
36.9
Very Low 2.47 / yr $193K
47 Sevier County
36.2
Very Low 0.47 / yr $162K
48 McMinn County
35.9
Very Low 1.68 / yr $160K
49 Putnam County
35.6
Very Low 1.05 / yr $178K
50 Monroe County
34.4
Very Low 0.84 / yr $124K
51 Anderson County
33.3
Very Low 0.84 / yr $149K
52 Marshall County
32.8
Very Low 4.53 / yr $217K
53 Perry County
30.5
Very Low 5.79 / yr $90K
54 Loudon County
29.9
Very Low 0.90 / yr $109K
55 Roane County
29.6
Very Low 0.89 / yr $103K
56 Rhea County
28.4
Very Low 1.68 / yr $105K
57 Marion County
27.5
Very Low 1.63 / yr $95K
58 Lewis County
27.2
Very Low 5.63 / yr $107K
59 Houston County
26.9
Very Low 5.74 / yr $106K
60 Smith County
25.8
Very Low 3.95 / yr $144K
61 DeKalb County
24.4
Very Low 2.58 / yr $81K
62 Jackson County
24.2
Very Low 2.21 / yr $54K
63 Hamblen County
23.0
Very Low 0.47 / yr $65K
64 Jefferson County
22.1
Very Low 0.53 / yr $64K
65 Warren County
20.7
Very Low 0.89 / yr $53K
66 Cannon County
20.5
Very Low 2.63 / yr $58K
67 Trousdale County
19.7
Very Low 4.26 / yr $81K
68 Meigs County
19.0
Very Low 1.68 / yr $42K
69 Polk County
18.7
Very Low 0.91 / yr $37K
70 Sullivan County
18.5
Very Low 0.11 / yr $51K
71 White County
18.2
Very Low 0.89 / yr $43K
72 Cocke County
18.1
Very Low 0.28 / yr $34K
73 Moore County
17.3
Very Low 4.84 / yr $41K
74 Clay County
17.2
Very Low 2.16 / yr $35K
75 Washington County
16.8
Very Low 0.11 / yr $45K
76 Overton County
16.7
Very Low 0.89 / yr $41K
77 Sequatchie County
16.3
Very Low 1.47 / yr $37K
78 Bledsoe County
16.2
Very Low 1.16 / yr $31K
79 Greene County
15.0
Very Low 0.14 / yr $26K
80 Grainger County
14.3
Very Low 0.47 / yr $25K
81 Carter County
13.7
Very Low 0.05 / yr $21K
82 Hawkins County
12.6
Very Low 0.16 / yr $20K
83 Union County
11.6
Very Low 0.47 / yr $21K
84 Claiborne County
9.8
Very Low 0.16 / yr $13K
85 Campbell County
8.5
Very Low 0.11 / yr $9K
86 Pickett County
8.3
Very Low 0.84 / yr $9K
87 Scott County
6.2
Very Low 0.11 / yr $6K
88 Grundy County
5.7
Very Low 0.21 / yr $4K
89 Fentress County
5.4
Very Low 0.11 / yr $4K
90 Morgan County
4.5
Very Low 0.11 / yr $5K
91 Hancock County
4.0
Very Low 0.16 / yr $2K
92 Van Buren County
3.1
Very Low 0.16 / yr $2K
93 Johnson County
2.0
Very Low 0.00 / yr $0
94 Unicoi County
1.8
Very Low 0.00 / yr $0

94 Tennessee counties with measurable heat wave risk. See the national heat wave ranking or all Tennessee counties by overall risk.

Frequently Asked Questions

Which Tennessee county has the highest heat wave risk?

Shelby County has the highest FEMA heat wave risk score in Tennessee at 99.6 (High), with $49M in expected annual losses and about 21.74 events per year.

How many Tennessee counties face significant heat wave risk?

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

Other Hazards in Tennessee

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