Lexington, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 23 °C (high). Annual precipitation averages 1005.3 Millimeters. Lexington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 10.7 °C | 39.37 mm |
| February | -0.5 °C | 13.2 °C | 46.99 mm |
| March | 4.3 °C | 18.2 °C | 75.69 mm |
| April | 8.8 °C | 22.9 °C | 100.84 mm |
| May | 14.6 °C | 26.9 °C | 142.24 mm |
| June | 19.4 °C | 31.6 °C | 118.11 mm |
| July | 21.6 °C | 34.6 °C | 90.42 mm |
| August | 20.8 °C | 34.6 °C | 80.26 mm |
| September | 16.4 °C | 30.2 °C | 101.85 mm |
| October | 9.8 °C | 24.2 °C | 89.92 mm |
| November | 3.7 °C | 17.4 °C | 59.44 mm |
| December | -1.3 °C | 11.6 °C | 60.2 mm |
| Annual | 9.6 °C | 23 °C | 1005.33 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |