Gallatin, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42 °F (low) to 62.9 °F (high). Annual precipitation averages 39.9 Inches. 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 | 16.4 °F | 34.7 °F | 1.08 in. |
| February | 20.1 °F | 40.1 °F | 1.69 in. |
| March | 30.5 °F | 52.2 °F | 2.45 in. |
| April | 40.8 °F | 63.5 °F | 3.62 in. |
| May | 52.4 °F | 73.5 °F | 5.5 in. |
| June | 62.3 °F | 82.8 °F | 5.4 in. |
| July | 66.4 °F | 87.1 °F | 4.28 in. |
| August | 64.1 °F | 85.6 °F | 4.48 in. |
| September | 55.2 °F | 78.0 °F | 4.42 in. |
| October | 43.1 °F | 66.0 °F | 3.24 in. |
| November | 31.6 °F | 52.2 °F | 2.06 in. |
| December | 21.5 °F | 39.5 °F | 1.65 in. |
| Annual | 42 °F | 62.9 °F | 39.87 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |