| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72f - River Hills |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 65039 - Hartsburg, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 22 | 31 | 41 | 52 | 61 | 66 | 64 | 55 | 43 | 32 | 22 | 42 |
| Avg Max Temp (°F) | 38 | 44 | 55 | 66 | 75 | 84 | 89 | 88 | 80 | 69 | 54 | 42 | 65 |
| Avg Precip (In.) | 1.66 | 2.04 | 3.18 | 3.93 | 4.97 | 4.08 | 3.79 | 3.58 | 3.61 | 3.24 | 3.49 | 2.5 | 40.06 |