| 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70b - Monongahela Transition Zone |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 15627 - Derry, 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 | 53 | 41 | 33 | 24 | 40 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 70 | 78 | 82 | 80 | 74 | 62 | 50 | 40 | 60 |
| Avg Precip (In.) | 3.06 | 2.67 | 3.52 | 3.49 | 4.23 | 4.44 | 4.52 | 3.99 | 3.95 | 2.85 | 3.56 | 3.07 | 43.35 |