| 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: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70c - Pittsburgh Low Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16041 - Karns City, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 26 | 35 | 45 | 54 | 59 | 57 | 51 | 39 | 31 | 22 | 38 |
| Avg Max Temp (°F) | 36 | 40 | 50 | 63 | 73 | 81 | 84 | 83 | 76 | 66 | 51 | 40 | 62 |
| Avg Precip (In.) | 2.78 | 2.39 | 3.25 | 3.5 | 3.93 | 4.87 | 4.35 | 4.14 | 3.92 | 2.92 | 3.44 | 3.17 | 42.66 |