| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 39a - Springfield Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 65712 - Mount Vernon, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 24 | 34 | 43 | 52 | 61 | 66 | 64 | 56 | 44 | 33 | 24 | 43 |
| Avg Max Temp (°F) | 42 | 48 | 57 | 67 | 75 | 83 | 89 | 89 | 81 | 70 | 56 | 46 | 67 |
| Avg Precip (In.) | 1.91 | 2.04 | 3.82 | 4.15 | 4.76 | 5.28 | 3.41 | 3.85 | 5.13 | 3.52 | 4.48 | 2.94 | 45.3 |