Hallsville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 17.8 °C (high). Annual precipitation averages 1074.4 Millimeters. Hallsville 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 | -6.8 °C | 3 °C | 51.31 mm |
| February | -4.7 °C | 5.7 °C | 54.36 mm |
| March | 0.4 °C | 12.1 °C | 76.2 mm |
| April | 6.4 °C | 18.3 °C | 116.33 mm |
| May | 12.3 °C | 23.3 °C | 128.27 mm |
| June | 17.3 °C | 28.2 °C | 125.73 mm |
| July | 19.4 °C | 30.4 °C | 110.49 mm |
| August | 18.4 °C | 29.9 °C | 96.27 mm |
| September | 13.6 °C | 26.2 °C | 105.41 mm |
| October | 7.2 °C | 19.4 °C | 84.07 mm |
| November | 1.4 °C | 11.9 °C | 72.9 mm |
| December | -3.7 °C | 5.3 °C | 53.09 mm |
| Annual | 6.8 °C | 17.8 °C | 1074.43 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |