Elkhorn, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 27.2 °F (low) to 48.9 °F (high). Annual precipitation averages 23.8 Inches. 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 | 13.9 °F | 30.3 °F | 1.43 in. |
| February | 12.4 °F | 31.5 °F | 1.51 in. |
| March | 17.9 °F | 38.3 °F | 1.82 in. |
| April | 23.3 °F | 45.3 °F | 2.55 in. |
| May | 31.4 °F | 54.3 °F | 3.19 in. |
| June | 38.5 °F | 63.0 °F | 3.46 in. |
| July | 45.7 °F | 74.0 °F | 1.77 in. |
| August | 44.7 °F | 73.3 °F | 1.48 in. |
| September | 37.5 °F | 63.2 °F | 1.58 in. |
| October | 28.0 °F | 49.0 °F | 1.78 in. |
| November | 19.5 °F | 36.2 °F | 1.64 in. |
| December | 13.2 °F | 28.8 °F | 1.6 in. |
| Annual | 27.2 °F | 48.9 °F | 23.81 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |