| 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. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| 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 45377 - Vandalia, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 31 | 41 | 51 | 61 | 65 | 62 | 55 | 44 | 35 | 25 | 42 |
| Avg Max Temp (°F) | 34 | 39 | 50 | 62 | 72 | 81 | 85 | 83 | 76 | 64 | 51 | 39 | 61 |
| Avg Precip (In.) | 2.51 | 2.27 | 3.14 | 3.85 | 4.23 | 4.26 | 3.92 | 3.48 | 2.7 | 2.68 | 3.25 | 2.92 | 39.21 |