| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 45304 - Arcanum, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 29 | 38 | 49 | 58 | 62 | 59 | 52 | 40 | 32 | 22 | 40 |
| Avg Max Temp (°F) | 33 | 38 | 49 | 61 | 72 | 80 | 84 | 82 | 76 | 64 | 50 | 38 | 61 |
| Avg Precip (In.) | 2.39 | 2.16 | 3.02 | 3.66 | 4.26 | 4.18 | 4.03 | 3.48 | 2.61 | 2.74 | 3.17 | 2.85 | 38.55 |