| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 70c - Pittsburgh Low Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16242 - New Bethlehem, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 25 | 34 | 44 | 53 | 58 | 56 | 49 | 38 | 30 | 21 | 37 |
| Avg Max Temp (°F) | 34 | 37 | 47 | 59 | 70 | 78 | 82 | 81 | 74 | 62 | 49 | 38 | 59 |
| Avg Precip (In.) | 3.04 | 2.64 | 3.54 | 3.55 | 4.02 | 4.83 | 4.53 | 4.13 | 4.1 | 3.04 | 3.59 | 3.3 | 44.3 |