Lenexa, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45 °F (low) to 65 °F (high). Annual precipitation averages 41.4 Inches. Lenexa is located in USDA Plant Hardiness Zone 6b. 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 | 20.2 °F | 38.9 °F | 1.33 in. |
| February | 23.8 °F | 43.6 °F | 1.65 in. |
| March | 33.4 °F | 54.7 °F | 2.53 in. |
| April | 44.0 °F | 65.4 °F | 4.03 in. |
| May | 54.9 °F | 74.2 °F | 5.6 in. |
| June | 64.6 °F | 83.6 °F | 5.49 in. |
| July | 68.7 °F | 88.3 °F | 4.45 in. |
| August | 66.8 °F | 87.1 °F | 4.5 in. |
| September | 58.4 °F | 79.5 °F | 4.43 in. |
| October | 45.9 °F | 67.3 °F | 3.42 in. |
| November | 34.6 °F | 54.6 °F | 2.28 in. |
| December | 24.7 °F | 42.5 °F | 1.71 in. |
| Annual | 45 °F | 65 °F | 41.42 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |