| 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: | 39f - St. Francois Knobs and Basins |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 63957 - Piedmont, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 34 | 43 | 52 | 61 | 66 | 64 | 56 | 44 | 34 | 25 | 44 |
| Avg Max Temp (°F) | 42 | 49 | 59 | 70 | 78 | 86 | 91 | 89 | 81 | 71 | 57 | 46 | 68 |
| Avg Precip (In.) | 2.99 | 3.01 | 4.43 | 4.51 | 4.5 | 3.75 | 3.89 | 3.57 | 3.36 | 3.17 | 4.82 | 4.12 | 46.1 |