| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 40a - Loess Flats and Till Plains |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 64490 - Stewartsville, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 18 | 29 | 39 | 50 | 60 | 64 | 62 | 53 | 41 | 29 | 18 | 40 |
| Avg Max Temp (°F) | 34 | 41 | 53 | 64 | 74 | 83 | 88 | 86 | 78 | 67 | 51 | 38 | 63 |
| Avg Precip (In.) | 1.09 | 1.15 | 2.53 | 3.35 | 4.92 | 4.4 | 4.47 | 3.87 | 4.59 | 3.06 | 2.27 | 1.47 | 37.17 |