Elkhorn, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.7 °C (low) to 9.4 °C (high). Annual precipitation averages 604.8 Millimeters. Elkhorn is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 21 - Jun. 30 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | -0.9 °C | 36.32 mm |
| February | -10.9 °C | -0.3 °C | 38.35 mm |
| March | -7.8 °C | 3.5 °C | 46.23 mm |
| April | -4.8 °C | 7.4 °C | 64.77 mm |
| May | -0.3 °C | 12.4 °C | 81.03 mm |
| June | 3.6 °C | 17.2 °C | 87.88 mm |
| July | 7.6 °C | 23.3 °C | 44.96 mm |
| August | 7.1 °C | 22.9 °C | 37.59 mm |
| September | 3.1 °C | 17.3 °C | 40.13 mm |
| October | -2.2 °C | 9.4 °C | 45.21 mm |
| November | -6.9 °C | 2.3 °C | 41.66 mm |
| December | -10.4 °C | -1.8 °C | 40.64 mm |
| Annual | -2.7 °C | 9.4 °C | 604.77 mm |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 21 - Jun. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |