New Springfield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 15.5 °C (high). Annual precipitation averages 1042.9 Millimeters. New Springfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.2 °C | 75.69 mm |
| February | -7.7 °C | 2.9 °C | 58.17 mm |
| March | -3.2 °C | 8.2 °C | 78.99 mm |
| April | 2.7 °C | 15.6 °C | 96.27 mm |
| May | 8.2 °C | 21.4 °C | 97.79 mm |
| June | 13.2 °C | 26 °C | 110.24 mm |
| July | 15.2 °C | 28 °C | 111.51 mm |
| August | 14.3 °C | 27.3 °C | 88.65 mm |
| September | 10.4 °C | 24.1 °C | 96.27 mm |
| October | 4.4 °C | 17 °C | 80.77 mm |
| November | -0.3 °C | 9.8 °C | 73.41 mm |
| December | -4.6 °C | 3.9 °C | 75.18 mm |
| Annual | 3.7 °C | 15.5 °C | 1042.94 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |