Houston, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 19.4 °C (high). Annual precipitation averages 1173 Millimeters. Houston is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 6 °C | 64.77 mm |
| February | -3.3 °C | 8.8 °C | 74.17 mm |
| March | 1.1 °C | 14.1 °C | 105.92 mm |
| April | 6.6 °C | 20.1 °C | 128.78 mm |
| May | 12 °C | 24.3 °C | 140.46 mm |
| June | 16.8 °C | 28.5 °C | 99.06 mm |
| July | 18.9 °C | 30.9 °C | 103.38 mm |
| August | 18 °C | 30.7 °C | 94.74 mm |
| September | 13.4 °C | 26.7 °C | 102.62 mm |
| October | 6.9 °C | 20.7 °C | 84.33 mm |
| November | 1.4 °C | 13.8 °C | 102.11 mm |
| December | -3.3 °C | 7.7 °C | 72.64 mm |
| Annual | 6.9 °C | 19.4 °C | 1172.98 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |