| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 63556 - Milan, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 18 | 28 | 39 | 50 | 60 | 64 | 62 | 53 | 42 | 29 | 18 | 40 |
| Avg Max Temp (°F) | 32 | 39 | 51 | 63 | 73 | 82 | 87 | 85 | 77 | 66 | 50 | 37 | 62 |
| Avg Precip (In.) | 1.22 | 1.28 | 2.58 | 3.55 | 5.09 | 4.14 | 4.86 | 4.13 | 4.33 | 3.06 | 2.75 | 1.71 | 38.69 |