Gallatin Gateway, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 13.6 °C (high). Annual precipitation averages 452.4 Millimeters. 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 | -9.3 °C | 1.6 °C | 17.53 mm |
| February | -8.8 °C | 3 °C | 17.53 mm |
| March | -5 °C | 7.8 °C | 29.46 mm |
| April | -1.5 °C | 12.2 °C | 56.64 mm |
| May | 2.9 °C | 17.2 °C | 68.33 mm |
| June | 6.6 °C | 22 °C | 75.95 mm |
| July | 9.8 °C | 28.1 °C | 33.78 mm |
| August | 8.9 °C | 27.9 °C | 30.48 mm |
| September | 5.2 °C | 22.2 °C | 34.54 mm |
| October | -0.1 °C | 14 °C | 41.4 mm |
| November | -5.3 °C | 6.2 °C | 25.15 mm |
| December | -9.5 °C | 1.3 °C | 21.59 mm |
| Annual | -0.5 °C | 13.6 °C | 452.38 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |