Lexington, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 64.4 °F (high). Annual precipitation averages 42.6 Inches. Lexington is located in USDA Plant Hardiness Zone 6a. 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 | 18.4 °F | 37.6 °F | 1.47 in. |
| February | 22.7 °F | 43.0 °F | 1.87 in. |
| March | 32.1 °F | 54.1 °F | 2.78 in. |
| April | 42.5 °F | 64.9 °F | 4.25 in. |
| May | 53.3 °F | 74.6 °F | 5.57 in. |
| June | 63.2 °F | 83.3 °F | 5.43 in. |
| July | 67.1 °F | 87.3 °F | 4.8 in. |
| August | 64.7 °F | 86.5 °F | 4.39 in. |
| September | 56.0 °F | 78.9 °F | 4.38 in. |
| October | 44.1 °F | 67.6 °F | 3.39 in. |
| November | 32.9 °F | 53.3 °F | 2.43 in. |
| December | 23.3 °F | 41.8 °F | 1.8 in. |
| Annual | 43.4 °F | 64.4 °F | 42.56 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |