Gallatin, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 17.2 °C (high). Annual precipitation averages 1012.7 Millimeters. Gallatin is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | 1.5 °C | 27.43 mm |
| February | -6.6 °C | 4.5 °C | 42.93 mm |
| March | -0.8 °C | 11.2 °C | 62.23 mm |
| April | 4.9 °C | 17.5 °C | 91.95 mm |
| May | 11.3 °C | 23.1 °C | 139.7 mm |
| June | 16.8 °C | 28.2 °C | 137.16 mm |
| July | 19.1 °C | 30.6 °C | 108.71 mm |
| August | 17.8 °C | 29.8 °C | 113.79 mm |
| September | 12.9 °C | 25.6 °C | 112.27 mm |
| October | 6.2 °C | 18.9 °C | 82.3 mm |
| November | -0.2 °C | 11.2 °C | 52.32 mm |
| December | -5.8 °C | 4.2 °C | 41.91 mm |
| Annual | 5.6 °C | 17.2 °C | 1012.7 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |