| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70b - Monongahela Transition Zone |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 15637 - Herminie, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 20 | 28 | 37 | 47 | 56 | 61 | 59 | 52 | 41 | 33 | 24 | 40 |
| Avg Max Temp (°F) | 37 | 40 | 50 | 61 | 72 | 80 | 83 | 82 | 76 | 64 | 52 | 42 | 62 |
| Avg Precip (In.) | 2.81 | 2.52 | 3.37 | 3.39 | 4.05 | 3.81 | 4.09 | 3.88 | 3.62 | 2.49 | 3.38 | 2.9 | 40.32 |