Lame Deer, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.5 °C (low) to 15.8 °C (high). Annual precipitation averages 416.3 Millimeters. Lame Deer is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | 2 °C | 13.21 mm |
| February | -10.4 °C | 3.7 °C | 14.99 mm |
| March | -5.6 °C | 9.6 °C | 26.16 mm |
| April | -1.2 °C | 14.6 °C | 42.67 mm |
| May | 3.9 °C | 19.6 °C | 85.09 mm |
| June | 8.7 °C | 25.6 °C | 67.31 mm |
| July | 12.2 °C | 31.2 °C | 38.86 mm |
| August | 10.9 °C | 31 °C | 21.34 mm |
| September | 5.8 °C | 25.2 °C | 35.56 mm |
| October | -0.6 °C | 16.4 °C | 38.1 mm |
| November | -6.3 °C | 8.3 °C | 19.56 mm |
| December | -11.3 °C | 2.7 °C | 13.46 mm |
| Annual | -0.5 °C | 15.8 °C | 416.31 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |