New Madison, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 60.8 °F (high). Annual precipitation averages 41.4 Inches. New Madison is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 34.1 °F | 3.0 in. |
| February | 20.9 °F | 38.2 °F | 2.29 in. |
| March | 29.0 °F | 48.5 °F | 3.33 in. |
| April | 39.5 °F | 61.7 °F | 4.27 in. |
| May | 50.7 °F | 71.7 °F | 4.48 in. |
| June | 59.8 °F | 80.2 °F | 4.67 in. |
| July | 62.5 °F | 83.0 °F | 4.01 in. |
| August | 60.5 °F | 82.0 °F | 3.17 in. |
| September | 53.0 °F | 76.5 °F | 2.98 in. |
| October | 42.1 °F | 64.3 °F | 3.0 in. |
| November | 32.0 °F | 50.6 °F | 3.16 in. |
| December | 24.0 °F | 38.9 °F | 3.08 in. |
| Annual | 41 °F | 60.8 °F | 41.44 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |