| 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. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 70f - Ohio/Kentucky Carboniferous Plateau |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 41143 - Grayson, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 29 | 37 | 47 | 57 | 61 | 60 | 52 | 39 | 31 | 24 | 40 |
| Avg Max Temp (°F) | 41 | 46 | 57 | 67 | 76 | 83 | 87 | 86 | 80 | 69 | 57 | 46 | 66 |
| Avg Precip (In.) | 3.12 | 3.04 | 3.82 | 3.44 | 4.47 | 4.16 | 4.73 | 3.63 | 2.7 | 2.9 | 3.15 | 3.56 | 42.73 |