Emigrant, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 14.1 °C (high). Annual precipitation averages 338.3 Millimeters. Emigrant is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 1.8 °C | 11.94 mm |
| February | -7.9 °C | 3.2 °C | 9.91 mm |
| March | -4.2 °C | 8.3 °C | 16.76 mm |
| April | -0.8 °C | 12.8 °C | 34.04 mm |
| May | 3.4 °C | 17.8 °C | 48.26 mm |
| June | 7.3 °C | 22.8 °C | 56.64 mm |
| July | 10.4 °C | 28.8 °C | 36.32 mm |
| August | 9.6 °C | 28.4 °C | 31.5 mm |
| September | 5.8 °C | 22.8 °C | 30.48 mm |
| October | 0.6 °C | 14.6 °C | 26.67 mm |
| November | -4.5 °C | 6.5 °C | 19.81 mm |
| December | -8.4 °C | 1.4 °C | 16 mm |
| Annual | 0.3 °C | 14.1 °C | 338.33 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |