| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55e - Darby Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 43140 - London, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 28 | 37 | 48 | 58 | 61 | 59 | 52 | 40 | 31 | 23 | 39 |
| Avg Max Temp (°F) | 33 | 38 | 49 | 61 | 72 | 80 | 84 | 82 | 76 | 64 | 50 | 39 | 61 |
| Avg Precip (In.) | 2.43 | 2.23 | 2.82 | 3.55 | 4.11 | 4.27 | 4.05 | 3.51 | 2.82 | 2.58 | 3.25 | 2.92 | 38.55 |