Heat Wave Risk in Pennsylvania

All Pennsylvania 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 67 of 67 Pennsylvania counties in FEMA's National Risk Index. Philadelphia County carries the state's highest heat wave score at 100.0, with $256M in expected annual heat wave losses.

3 Pennsylvania counties are rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $365M 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 Philadelphia County
100.0
Very High 11.07 / yr $256M
2 Montgomery County
98.3
High 9.59 / yr $20M
3 Delaware County
97.6
High 11.06 / yr $13M
4 Lehigh County
96.5
Medium 6.05 / yr $7M
5 Chester County
95.6
Medium 9.18 / yr $11M
6 Bucks County
95.1
Medium 9.64 / yr $7M
7 Berks County
94.5
Medium 6.32 / yr $5M
8 Lancaster County
94.4
Medium 5.26 / yr $5M
9 Allegheny County
94.3
Medium 1.95 / yr $5M
10 Northampton County
94.1
Medium 5.95 / yr $5M
11 York County
91.8
Medium 5.26 / yr $4M
12 Luzerne County
91.3
Medium 2.47 / yr $3M
13 Dauphin County
88.4
Medium 5.05 / yr $3M
14 Cumberland County
85.6
Medium 4.63 / yr $2M
15 Lackawanna County
83.6
Medium 2.48 / yr $2M
16 Carbon County
82.1
Medium 1.89 / yr $2M
17 Lebanon County
75.7
Low 5.05 / yr $1M
18 Monroe County
74.7
Low 1.89 / yr $1M
19 Perry County
74.5
Low 4.32 / yr $1M
20 Schuylkill County
74.3
Low 2.53 / yr $967K
21 Franklin County
72.1
Low 4.26 / yr $1M
22 Adams County
68.6
Low 4.79 / yr $882K
23 Westmoreland County
59.9
Low 1.45 / yr $622K
24 Northumberland County
59.2
Low 2.84 / yr $512K
25 Lycoming County
52.5
Low 1.51 / yr $421K
26 Columbia County
52.5
Low 2.84 / yr $459K
27 Centre County
48.0
Low 1.09 / yr $316K
28 Washington County
47.8
Low 1.95 / yr $388K
29 Beaver County
45.7
Low 1.95 / yr $308K
30 Union County
44.7
Low 2.79 / yr $225K
31 Fayette County
44.1
Low 1.30 / yr $218K
32 Snyder County
43.6
Low 2.79 / yr $225K
33 Mifflin County
42.7
Low 1.84 / yr $170K
34 Butler County
41.1
Low 1.58 / yr $285K
35 Blair County
40.9
Low 1.32 / yr $215K
36 Erie County
40.6
Low 0.89 / yr $216K
37 Pike County
39.9
Low 1.90 / yr $222K
38 Juniata County
37.7
Very Low 2.68 / yr $150K
39 Bradford County
32.7
Very Low 1.68 / yr $158K
40 Indiana County
32.1
Very Low 1.19 / yr $122K
41 Wayne County
32.0
Very Low 1.50 / yr $138K
42 Bedford County
31.1
Very Low 1.37 / yr $127K
43 Armstrong County
30.8
Very Low 1.32 / yr $139K
44 Lawrence County
29.4
Very Low 1.53 / yr $124K
45 Wyoming County
29.2
Very Low 1.84 / yr $121K
46 Mercer County
28.4
Very Low 1.05 / yr $110K
47 Huntingdon County
28.1
Very Low 1.68 / yr $115K
48 Montour County
27.1
Very Low 2.84 / yr $105K
49 Crawford County
24.9
Very Low 0.89 / yr $72K
50 Clinton County
24.3
Very Low 0.88 / yr $74K
51 Susquehanna County
24.1
Very Low 1.47 / yr $92K
52 Greene County
22.5
Very Low 1.89 / yr $72K
53 Cambria County
21.7
Very Low 0.42 / yr $63K
54 Somerset County
20.3
Very Low 0.42 / yr $58K
55 Fulton County
18.0
Very Low 2.00 / yr $51K
56 Clearfield County
17.5
Very Low 0.42 / yr $41K
57 Tioga County
15.9
Very Low 0.68 / yr $36K
58 Venango County
15.0
Very Low 0.63 / yr $30K
59 Jefferson County
13.7
Very Low 0.47 / yr $22K
60 Clarion County
12.3
Very Low 0.63 / yr $23K
61 McKean County
10.5
Very Low 0.42 / yr $16K
62 Warren County
9.7
Very Low 0.42 / yr $16K
63 Elk County
7.9
Very Low 0.42 / yr $13K
64 Sullivan County
6.9
Very Low 0.74 / yr $8K
65 Potter County
6.6
Very Low 0.42 / yr $7K
66 Forest County
4.4
Very Low 0.47 / yr $3K
67 Cameron County
3.4
Very Low 0.42 / yr $2K

67 Pennsylvania counties with measurable heat wave risk. See the national heat wave ranking or all Pennsylvania counties by overall risk.

Frequently Asked Questions

Which Pennsylvania county has the highest heat wave risk?

Philadelphia County has the highest FEMA heat wave risk score in Pennsylvania at 100.0 (Very High), with $256M in expected annual losses and about 11.07 events per year.

How many Pennsylvania counties face significant heat wave risk?

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

Other Hazards in Pennsylvania