| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 70f - Ohio/Kentucky Carboniferous Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 45638 - Ironton, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 24 | 32 | 41 | 50 | 59 | 64 | 62 | 55 | 43 | 34 | 26 | 43 |
| Avg Max Temp (°F) | 41 | 46 | 56 | 67 | 76 | 84 | 87 | 86 | 79 | 68 | 56 | 46 | 66 |
| Avg Precip (In.) | 3.14 | 3.04 | 3.73 | 3.46 | 4.4 | 4.13 | 4.66 | 4.05 | 2.86 | 2.78 | 3.18 | 3.48 | 42.91 |