| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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. 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: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 63401 - Hannibal, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 21 | 32 | 43 | 53 | 62 | 67 | 65 | 56 | 44 | 33 | 22 | 43 |
| Avg Max Temp (°F) | 34 | 40 | 52 | 64 | 74 | 83 | 87 | 85 | 78 | 67 | 52 | 38 | 63 |
| Avg Precip (In.) | 1.69 | 2.05 | 3.17 | 3.72 | 4.81 | 3.54 | 4.24 | 3.89 | 3.4 | 3.11 | 3.42 | 2.52 | 39.56 |