London, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 22.6 °C (high). Annual precipitation averages 1293.6 Millimeters. London is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.5 °C | 10 °C | 92.96 mm |
| February | 0.2 °C | 12.9 °C | 87.88 mm |
| March | 4.3 °C | 17.8 °C | 118.87 mm |
| April | 9.1 °C | 22.9 °C | 129.29 mm |
| May | 14.7 °C | 27 °C | 140.72 mm |
| June | 19.2 °C | 31.3 °C | 100.33 mm |
| July | 21.3 °C | 33.8 °C | 94.74 mm |
| August | 20.4 °C | 33.7 °C | 92.71 mm |
| September | 16.2 °C | 29.9 °C | 95.76 mm |
| October | 9.6 °C | 23.9 °C | 103.38 mm |
| November | 3.9 °C | 16.7 °C | 122.68 mm |
| December | -0.1 °C | 11.3 °C | 114.3 mm |
| Annual | 9.8 °C | 22.6 °C | 1293.62 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |