| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 83a - Erie Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16421 - Harborcreek, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 20 | 28 | 37 | 48 | 58 | 63 | 62 | 55 | 45 | 36 | 26 | 41 |
| Avg Max Temp (°F) | 33 | 35 | 45 | 56 | 67 | 76 | 80 | 79 | 72 | 61 | 49 | 38 | 58 |
| Avg Precip (In.) | 2.54 | 2.24 | 3.02 | 3.38 | 3.43 | 4.29 | 3.64 | 4.18 | 4.8 | 4.11 | 4.07 | 3.59 | 43.28 |