| 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 61c - Low Lime Drift Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 44270 - Rittman, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 48 | 57 | 61 | 59 | 52 | 41 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 32 | 36 | 47 | 59 | 69 | 78 | 82 | 80 | 73 | 61 | 49 | 37 | 59 |
| Avg Precip (In.) | 2.27 | 2.06 | 2.91 | 3.34 | 3.9 | 3.82 | 3.9 | 3.9 | 3.5 | 2.56 | 3.04 | 2.76 | 37.96 |