| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| 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: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 64660 - Mendon, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 21 | 31 | 41 | 52 | 61 | 66 | 63 | 55 | 44 | 31 | 21 | 42 |
| Avg Max Temp (°F) | 34 | 41 | 53 | 65 | 74 | 83 | 88 | 86 | 78 | 68 | 52 | 39 | 63 |
| Avg Precip (In.) | 1.44 | 1.48 | 2.7 | 3.59 | 4.87 | 4.17 | 4.17 | 3.67 | 4.13 | 3.31 | 2.99 | 1.98 | 38.51 |