| 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: | 61c - Low Lime Drift Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 43050 - Mount Vernon, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 18 | 27 | 36 | 46 | 56 | 59 | 57 | 50 | 38 | 30 | 21 | 38 |
| Avg Max Temp (°F) | 33 | 37 | 48 | 60 | 71 | 79 | 83 | 81 | 75 | 63 | 50 | 38 | 60 |
| Avg Precip (In.) | 2.64 | 2.22 | 3.02 | 3.54 | 4.19 | 4.35 | 4.21 | 3.85 | 3.28 | 2.59 | 3.27 | 2.89 | 40.06 |