| 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 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 61c - Low Lime Drift Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16101 - New Castle, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 25 | 34 | 45 | 54 | 58 | 57 | 50 | 38 | 31 | 22 | 37 |
| Avg Max Temp (°F) | 35 | 39 | 49 | 60 | 72 | 80 | 84 | 82 | 76 | 64 | 51 | 40 | 61 |
| Avg Precip (In.) | 2.37 | 2.12 | 2.99 | 3.28 | 3.54 | 4.32 | 4.17 | 3.58 | 3.73 | 2.62 | 3.2 | 2.85 | 38.77 |