| 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 Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55d - Pre-Wisconsinan Drift Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 47031 - Milan, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 31 | 40 | 50 | 59 | 63 | 62 | 54 | 42 | 34 | 25 | 42 |
| Avg Max Temp (°F) | 37 | 42 | 53 | 64 | 74 | 81 | 85 | 84 | 78 | 66 | 53 | 42 | 63 |
| Avg Precip (In.) | 3.02 | 2.79 | 3.98 | 4.08 | 4.91 | 4.32 | 4.17 | 3.88 | 2.91 | 3.03 | 3.65 | 3.41 | 44.15 |