Excello, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.7 °F (low) to 63.1 °F (high). Annual precipitation averages 42.4 Inches. Excello is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.4 °F | 35.4 °F | 1.71 in. |
| February | 21.0 °F | 40.7 °F | 1.98 in. |
| March | 31.1 °F | 52.3 °F | 2.78 in. |
| April | 42.0 °F | 63.8 °F | 4.42 in. |
| May | 53.1 °F | 73.5 °F | 5.42 in. |
| June | 62.5 °F | 82.5 °F | 5.52 in. |
| July | 66.5 °F | 86.8 °F | 4.65 in. |
| August | 64.1 °F | 85.7 °F | 3.93 in. |
| September | 55.2 °F | 78.2 °F | 4.06 in. |
| October | 44.0 °F | 66.3 °F | 3.33 in. |
| November | 32.8 °F | 52.5 °F | 2.59 in. |
| December | 22.9 °F | 40.0 °F | 1.96 in. |
| Annual | 42.7 °F | 63.1 °F | 42.35 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |