London, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 61.4 °F (high). Annual precipitation averages 41.3 Inches. 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 | 19.8 °F | 35.1 °F | 3.06 in. |
| February | 21.7 °F | 38.8 °F | 2.42 in. |
| March | 29.8 °F | 49.2 °F | 3.27 in. |
| April | 40.1 °F | 61.9 °F | 4.0 in. |
| May | 51.3 °F | 72.6 °F | 4.67 in. |
| June | 60.4 °F | 80.9 °F | 4.42 in. |
| July | 63.2 °F | 83.5 °F | 4.55 in. |
| August | 60.9 °F | 82.3 °F | 3.25 in. |
| September | 53.8 °F | 77.3 °F | 3.03 in. |
| October | 42.5 °F | 64.8 °F | 2.66 in. |
| November | 32.4 °F | 51.0 °F | 3.02 in. |
| December | 25.4 °F | 39.8 °F | 2.97 in. |
| Annual | 41.8 °F | 61.4 °F | 41.32 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 |