| 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 5a: -20F to -15F |
| 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 44201 - Atwater, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 47 | 56 | 61 | 59 | 52 | 41 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 33 | 37 | 47 | 59 | 70 | 78 | 82 | 80 | 73 | 62 | 49 | 38 | 59 |
| Avg Precip (In.) | 2.41 | 2.15 | 3.03 | 3.33 | 3.83 | 4.03 | 4.14 | 3.62 | 3.76 | 2.7 | 3.2 | 2.99 | 39.17 |