New London, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.3 °C (high). Annual precipitation averages 1024.4 Millimeters. New London 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 | -7.6 °C | 0.8 °C | 71.88 mm |
| February | -6.9 °C | 2.3 °C | 56.39 mm |
| March | -2.4 °C | 7.7 °C | 73.91 mm |
| April | 3.4 °C | 15.3 °C | 98.81 mm |
| May | 9.5 °C | 21.4 °C | 99.57 mm |
| June | 14.8 °C | 26.2 °C | 106.93 mm |
| July | 16.7 °C | 28.2 °C | 107.44 mm |
| August | 15.7 °C | 27.3 °C | 101.35 mm |
| September | 11.7 °C | 24.1 °C | 84.58 mm |
| October | 5.8 °C | 17.2 °C | 80.01 mm |
| November | 0.4 °C | 9.8 °C | 75.44 mm |
| December | -4.3 °C | 3.6 °C | 68.07 mm |
| Annual | 4.7 °C | 15.3 °C | 1024.38 mm |
| 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 : -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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |