Leach, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.2 °C (high). Annual precipitation averages 1226.3 Millimeters. Leach is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 8.9 °C | 66.8 mm |
| February | -0.8 °C | 11.4 °C | 61.98 mm |
| March | 3.8 °C | 16.3 °C | 101.35 mm |
| April | 8.4 °C | 21.4 °C | 122.17 mm |
| May | 13.7 °C | 25.2 °C | 155.45 mm |
| June | 18.5 °C | 29.7 °C | 125.98 mm |
| July | 20.8 °C | 32.7 °C | 101.09 mm |
| August | 19.9 °C | 32.4 °C | 93.73 mm |
| September | 15.7 °C | 28.4 °C | 116.08 mm |
| October | 9.2 °C | 22.4 °C | 112.01 mm |
| November | 3.8 °C | 15.8 °C | 92.2 mm |
| December | -1.1 °C | 10.2 °C | 77.47 mm |
| Annual | 9.1 °C | 21.2 °C | 1226.31 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |