| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 69b - Uplands and Valleys of Mixed Land Use |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 15958 - Summerhill, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 18 | 26 | 35 | 44 | 53 | 57 | 56 | 49 | 38 | 30 | 22 | 37 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 70 | 78 | 82 | 80 | 73 | 63 | 50 | 39 | 60 |
| Avg Precip (In.) | 3.6 | 3.11 | 4.03 | 3.96 | 4.44 | 4.48 | 4.79 | 3.87 | 4.16 | 3.19 | 3.81 | 3.41 | 46.84 |