| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55c - Mad River Interlobate Area |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 45369 - South Vienna, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 20 | 29 | 38 | 49 | 58 | 62 | 60 | 52 | 41 | 32 | 23 | 40 |
| Avg Max Temp (°F) | 33 | 38 | 49 | 61 | 72 | 80 | 84 | 82 | 76 | 64 | 50 | 39 | 61 |
| Avg Precip (In.) | 2.43 | 2.16 | 2.85 | 3.55 | 4.21 | 4.29 | 4.15 | 3.75 | 2.92 | 2.62 | 3.19 | 2.84 | 38.95 |