New London, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 59.6 °F (high). Annual precipitation averages 40.3 Inches. 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 | 18.3 °F | 33.5 °F | 2.83 in. |
| February | 19.6 °F | 36.2 °F | 2.22 in. |
| March | 27.6 °F | 45.9 °F | 2.91 in. |
| April | 38.2 °F | 59.6 °F | 3.89 in. |
| May | 49.1 °F | 70.6 °F | 3.92 in. |
| June | 58.6 °F | 79.2 °F | 4.21 in. |
| July | 62.0 °F | 82.8 °F | 4.23 in. |
| August | 60.2 °F | 81.2 °F | 3.99 in. |
| September | 53.1 °F | 75.3 °F | 3.33 in. |
| October | 42.4 °F | 63.0 °F | 3.15 in. |
| November | 32.7 °F | 49.7 °F | 2.97 in. |
| December | 24.3 °F | 38.4 °F | 2.68 in. |
| Annual | 40.5 °F | 59.6 °F | 40.33 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |