Ellisville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 66.5 °F (high). Annual precipitation averages 44 Inches. Ellisville 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.5 °F | 41.0 °F | 2.76 in. |
| February | 27.4 °F | 45.9 °F | 2.48 in. |
| March | 36.1 °F | 56.6 °F | 3.64 in. |
| April | 46.5 °F | 67.5 °F | 4.76 in. |
| May | 57.1 °F | 76.4 °F | 5.24 in. |
| June | 66.2 °F | 84.7 °F | 4.59 in. |
| July | 70.1 °F | 88.4 °F | 3.98 in. |
| August | 68.1 °F | 87.2 °F | 3.55 in. |
| September | 60.5 °F | 80.8 °F | 3.27 in. |
| October | 48.2 °F | 69.0 °F | 3.37 in. |
| November | 37.8 °F | 55.3 °F | 3.61 in. |
| December | 29.4 °F | 44.7 °F | 2.76 in. |
| Annual | 47.7 °F | 66.5 °F | 44.01 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |