Huntsville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 17.8 °C (high). Annual precipitation averages 1074.7 Millimeters. Huntsville 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 | -7.3 °C | 2.7 °C | 45.97 mm |
| February | -5.2 °C | 5.6 °C | 52.07 mm |
| March | 0.4 °C | 12 °C | 77.72 mm |
| April | 6.2 °C | 18.4 °C | 114.55 mm |
| May | 12.2 °C | 23.4 °C | 133.1 mm |
| June | 17.4 °C | 28.4 °C | 132.33 mm |
| July | 19.6 °C | 30.6 °C | 117.86 mm |
| August | 18.2 °C | 29.9 °C | 97.79 mm |
| September | 13.4 °C | 26 °C | 99.57 mm |
| October | 7.1 °C | 19.6 °C | 83.57 mm |
| November | 1 °C | 11.9 °C | 68.07 mm |
| December | -4.3 °C | 5.2 °C | 52.07 mm |
| Annual | 6.6 °C | 17.8 °C | 1074.67 mm |
| 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |