Leslie, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 18.8 °C (high). Annual precipitation averages 1151.9 Millimeters. Leslie is located in USDA Plant Hardiness Zone 6b. 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 | -5.9 °C | 4.8 °C | 67.56 mm |
| February | -4.1 °C | 7.4 °C | 64.01 mm |
| March | 0.6 °C | 13.1 °C | 95 mm |
| April | 6.3 °C | 19.6 °C | 122.94 mm |
| May | 12.2 °C | 24.1 °C | 139.19 mm |
| June | 17.2 °C | 28.5 °C | 113.54 mm |
| July | 19.3 °C | 30.7 °C | 110.49 mm |
| August | 18.2 °C | 30.2 °C | 98.3 mm |
| September | 13.8 °C | 26.5 °C | 96.01 mm |
| October | 7.4 °C | 20.3 °C | 80.26 mm |
| November | 1.3 °C | 13 °C | 95.25 mm |
| December | -3.4 °C | 6.8 °C | 69.34 mm |
| Annual | 6.9 °C | 18.8 °C | 1151.89 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 6b : -20.6°C to -17.8°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 |