| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| 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: | 71f - Western Highland Rim |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 42045 - Grand Rivers, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 30 | 39 | 47 | 56 | 65 | 70 | 68 | 60 | 49 | 40 | 31 | 48 |
| Avg Max Temp (°F) | 44 | 51 | 61 | 72 | 80 | 89 | 92 | 91 | 84 | 73 | 60 | 48 | 70 |
| Avg Precip (In.) | 3.74 | 4.16 | 4.65 | 4.67 | 4.98 | 4.2 | 4.14 | 3.21 | 3.47 | 3.26 | 4.68 | 4.71 | 49.86 |