| 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 6b: -5°F to 0°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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83a - Erie Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 44057 - Madison, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 19 | 28 | 36 | 47 | 56 | 61 | 60 | 53 | 43 | 34 | 25 | 40 |
| Avg Max Temp (°F) | 34 | 36 | 47 | 57 | 69 | 77 | 81 | 80 | 74 | 62 | 50 | 40 | 59 |
| Avg Precip (In.) | 2.34 | 1.92 | 2.66 | 3.37 | 3.12 | 4.1 | 3.65 | 3.99 | 4.09 | 3.5 | 3.68 | 3.13 | 39.55 |