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
| # | County | Heat Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Philadelphia County | Very High | 11.07 / yr | $256M | |
| 2 | Montgomery County | High | 9.59 / yr | $20M | |
| 3 | Delaware County | High | 11.06 / yr | $13M | |
| 4 | Lehigh County | Medium | 6.05 / yr | $7M | |
| 5 | Chester County | Medium | 9.18 / yr | $11M | |
| 6 | Bucks County | Medium | 9.64 / yr | $7M | |
| 7 | Berks County | Medium | 6.32 / yr | $5M | |
| 8 | Lancaster County | Medium | 5.26 / yr | $5M | |
| 9 | Allegheny County | Medium | 1.95 / yr | $5M | |
| 10 | Northampton County | Medium | 5.95 / yr | $5M | |
| 11 | York County | Medium | 5.26 / yr | $4M | |
| 12 | Luzerne County | Medium | 2.47 / yr | $3M | |
| 13 | Dauphin County | Medium | 5.05 / yr | $3M | |
| 14 | Cumberland County | Medium | 4.63 / yr | $2M | |
| 15 | Lackawanna County | Medium | 2.48 / yr | $2M | |
| 16 | Carbon County | Medium | 1.89 / yr | $2M | |
| 17 | Lebanon County | Low | 5.05 / yr | $1M | |
| 18 | Monroe County | Low | 1.89 / yr | $1M | |
| 19 | Perry County | Low | 4.32 / yr | $1M | |
| 20 | Schuylkill County | Low | 2.53 / yr | $967K | |
| 21 | Franklin County | Low | 4.26 / yr | $1M | |
| 22 | Adams County | Low | 4.79 / yr | $882K | |
| 23 | Westmoreland County | Low | 1.45 / yr | $622K | |
| 24 | Northumberland County | Low | 2.84 / yr | $512K | |
| 25 | Lycoming County | Low | 1.51 / yr | $421K | |
| 26 | Columbia County | Low | 2.84 / yr | $459K | |
| 27 | Centre County | Low | 1.09 / yr | $316K | |
| 28 | Washington County | Low | 1.95 / yr | $388K | |
| 29 | Beaver County | Low | 1.95 / yr | $308K | |
| 30 | Union County | Low | 2.79 / yr | $225K | |
| 31 | Fayette County | Low | 1.30 / yr | $218K | |
| 32 | Snyder County | Low | 2.79 / yr | $225K | |
| 33 | Mifflin County | Low | 1.84 / yr | $170K | |
| 34 | Butler County | Low | 1.58 / yr | $285K | |
| 35 | Blair County | Low | 1.32 / yr | $215K | |
| 36 | Erie County | Low | 0.89 / yr | $216K | |
| 37 | Pike County | Low | 1.90 / yr | $222K | |
| 38 | Juniata County | Very Low | 2.68 / yr | $150K | |
| 39 | Bradford County | Very Low | 1.68 / yr | $158K | |
| 40 | Indiana County | Very Low | 1.19 / yr | $122K | |
| 41 | Wayne County | Very Low | 1.50 / yr | $138K | |
| 42 | Bedford County | Very Low | 1.37 / yr | $127K | |
| 43 | Armstrong County | Very Low | 1.32 / yr | $139K | |
| 44 | Lawrence County | Very Low | 1.53 / yr | $124K | |
| 45 | Wyoming County | Very Low | 1.84 / yr | $121K | |
| 46 | Mercer County | Very Low | 1.05 / yr | $110K | |
| 47 | Huntingdon County | Very Low | 1.68 / yr | $115K | |
| 48 | Montour County | Very Low | 2.84 / yr | $105K | |
| 49 | Crawford County | Very Low | 0.89 / yr | $72K | |
| 50 | Clinton County | Very Low | 0.88 / yr | $74K | |
| 51 | Susquehanna County | Very Low | 1.47 / yr | $92K | |
| 52 | Greene County | Very Low | 1.89 / yr | $72K | |
| 53 | Cambria County | Very Low | 0.42 / yr | $63K | |
| 54 | Somerset County | Very Low | 0.42 / yr | $58K | |
| 55 | Fulton County | Very Low | 2.00 / yr | $51K | |
| 56 | Clearfield County | Very Low | 0.42 / yr | $41K | |
| 57 | Tioga County | Very Low | 0.68 / yr | $36K | |
| 58 | Venango County | Very Low | 0.63 / yr | $30K | |
| 59 | Jefferson County | Very Low | 0.47 / yr | $22K | |
| 60 | Clarion County | Very Low | 0.63 / yr | $23K | |
| 61 | McKean County | Very Low | 0.42 / yr | $16K | |
| 62 | Warren County | Very Low | 0.42 / yr | $16K | |
| 63 | Elk County | Very Low | 0.42 / yr | $13K | |
| 64 | Sullivan County | Very Low | 0.74 / yr | $8K | |
| 65 | Potter County | Very Low | 0.42 / yr | $7K | |
| 66 | Forest County | Very Low | 0.47 / yr | $3K | |
| 67 | Cameron County | 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.