Madison, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.5 °C (low) to 14.4 °C (high). Annual precipitation averages 1104.9 Millimeters. Madison is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 1.1 °C | 78.23 mm |
| February | -6.6 °C | 2.1 °C | 57.66 mm |
| March | -2.8 °C | 6.3 °C | 73.66 mm |
| April | 3.3 °C | 13.6 °C | 98.55 mm |
| May | 9.6 °C | 19.7 °C | 97.54 mm |
| June | 14.9 °C | 24.4 °C | 103.12 mm |
| July | 17.5 °C | 26.6 °C | 103.38 mm |
| August | 16.8 °C | 25.9 °C | 93.22 mm |
| September | 13.1 °C | 22.8 °C | 112.01 mm |
| October | 7.4 °C | 16.1 °C | 100.08 mm |
| November | 1.8 °C | 9.8 °C | 93.98 mm |
| December | -2.8 °C | 3.9 °C | 93.47 mm |
| Annual | 5.5 °C | 14.4 °C | 1104.9 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |