| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70b - Monongahela Transition Zone |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 45780 - The Plains, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 19 | 28 | 36 | 46 | 55 | 60 | 58 | 51 | 38 | 31 | 23 | 39 |
| Avg Max Temp (°F) | 38 | 42 | 54 | 65 | 75 | 82 | 84 | 83 | 77 | 67 | 53 | 43 | 64 |
| Avg Precip (In.) | 2.75 | 2.68 | 3.31 | 3.15 | 4.14 | 3.87 | 4.24 | 3.94 | 2.96 | 2.55 | 3.04 | 3.05 | 39.69 |