| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 71k - Hills of the Bluegrass |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 41097 - Williamstown, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 26 | 34 | 43 | 53 | 61 | 65 | 64 | 57 | 46 | 36 | 27 | 45 |
| Avg Max Temp (°F) | 40 | 45 | 55 | 65 | 74 | 82 | 86 | 85 | 79 | 68 | 55 | 44 | 65 |
| Avg Precip (In.) | 3.01 | 2.95 | 4.32 | 4.09 | 4.72 | 4.38 | 4.18 | 3.9 | 3.12 | 2.98 | 3.51 | 3.51 | 44.67 |