| 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: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 67e - Anthracite Subregion |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 18433 - Jermyn, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 14 | 23 | 33 | 44 | 53 | 57 | 56 | 48 | 37 | 29 | 19 | 36 |
| Avg Max Temp (°F) | 32 | 34 | 43 | 56 | 68 | 76 | 80 | 78 | 70 | 59 | 47 | 36 | 57 |
| Avg Precip (In.) | 2.89 | 2.43 | 3.06 | 3.56 | 3.96 | 4.41 | 3.91 | 3.52 | 4.01 | 3.21 | 3.47 | 2.95 | 41.38 |