| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 39h - Current River Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 63967 - Williamsville, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 27 | 36 | 45 | 55 | 64 | 68 | 66 | 58 | 46 | 36 | 27 | 46 |
| Avg Max Temp (°F) | 42 | 49 | 59 | 70 | 78 | 86 | 91 | 89 | 82 | 71 | 58 | 46 | 68 |
| Avg Precip (In.) | 3.28 | 3.21 | 4.61 | 4.68 | 4.53 | 3.76 | 4.02 | 3.63 | 3 | 3.32 | 4.96 | 4.42 | 47.41 |