| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55a - Clayey High Lime Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 47390 - Union City, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 29 | 39 | 50 | 59 | 62 | 60 | 53 | 41 | 32 | 22 | 40 |
| Avg Max Temp (°F) | 32 | 37 | 48 | 60 | 71 | 80 | 84 | 82 | 76 | 64 | 50 | 37 | 60 |
| Avg Precip (In.) | 2.08 | 1.91 | 2.91 | 3.65 | 4.09 | 4.25 | 4.16 | 3.56 | 2.73 | 2.66 | 3.11 | 2.73 | 37.85 |