Gallatin Gateway, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.1 °F (low) to 56.5 °F (high). Annual precipitation averages 17.8 Inches. Gallatin Gateway is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.3 °F | 34.8 °F | 0.69 in. |
| February | 16.2 °F | 37.4 °F | 0.69 in. |
| March | 23.0 °F | 46.1 °F | 1.16 in. |
| April | 29.3 °F | 54.0 °F | 2.23 in. |
| May | 37.2 °F | 63.0 °F | 2.69 in. |
| June | 43.8 °F | 71.6 °F | 2.99 in. |
| July | 49.7 °F | 82.6 °F | 1.33 in. |
| August | 48.1 °F | 82.2 °F | 1.2 in. |
| September | 41.3 °F | 71.9 °F | 1.36 in. |
| October | 31.9 °F | 57.2 °F | 1.63 in. |
| November | 22.4 °F | 43.1 °F | 0.99 in. |
| December | 14.9 °F | 34.3 °F | 0.85 in. |
| Annual | 31.1 °F | 56.5 °F | 17.81 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |