Excello, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 17.3 °C (high). Annual precipitation averages 1075.7 Millimeters. 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 | -8.1 °C | 1.9 °C | 43.43 mm |
| February | -6.1 °C | 4.8 °C | 50.29 mm |
| March | -0.5 °C | 11.3 °C | 70.61 mm |
| April | 5.6 °C | 17.7 °C | 112.27 mm |
| May | 11.7 °C | 23.1 °C | 137.67 mm |
| June | 16.9 °C | 28.1 °C | 140.21 mm |
| July | 19.2 °C | 30.4 °C | 118.11 mm |
| August | 17.8 °C | 29.8 °C | 99.82 mm |
| September | 12.9 °C | 25.7 °C | 103.12 mm |
| October | 6.7 °C | 19.1 °C | 84.58 mm |
| November | 0.4 °C | 11.4 °C | 65.79 mm |
| December | -5.1 °C | 4.4 °C | 49.78 mm |
| Annual | 6 °C | 17.3 °C | 1075.68 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |