| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 40e - Claypan Prairie |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 63379 - Troy, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 33 | 43 | 53 | 62 | 67 | 64 | 56 | 44 | 35 | 24 | 44 |
| Avg Max Temp (°F) | 38 | 44 | 55 | 67 | 76 | 84 | 89 | 87 | 80 | 69 | 54 | 42 | 66 |
| Avg Precip (In.) | 1.89 | 1.95 | 3.41 | 3.72 | 4.39 | 3.82 | 3.82 | 3.27 | 3.25 | 2.78 | 3.58 | 2.86 | 38.74 |