| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°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: | 57a - Maumee Lake Plains |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 43447 - Millbury, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 30 | 40 | 51 | 61 | 65 | 64 | 56 | 45 | 35 | 25 | 43 |
| Avg Max Temp (°F) | 32 | 36 | 46 | 58 | 71 | 80 | 84 | 82 | 75 | 63 | 50 | 37 | 60 |
| Avg Precip (In.) | 1.92 | 1.86 | 2.57 | 3.21 | 3.17 | 3.84 | 3.2 | 3.27 | 2.87 | 2.43 | 2.93 | 2.6 | 33.86 |