Medicine Lake, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.9 °C (low) to 12.3 °C (high). Annual precipitation averages 344.2 Millimeters. Medicine Lake is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.5 °C | -5.4 °C | 7.62 mm |
| February | -14.9 °C | -2.5 °C | 5.33 mm |
| March | -8.6 °C | 4.2 °C | 10.67 mm |
| April | -1.7 °C | 13.2 °C | 22.1 mm |
| May | 4.4 °C | 19.8 °C | 51.31 mm |
| June | 10.1 °C | 24.3 °C | 76.96 mm |
| July | 12.8 °C | 28.6 °C | 62.48 mm |
| August | 11.6 °C | 28.8 °C | 35.05 mm |
| September | 5.8 °C | 22.8 °C | 28.7 mm |
| October | -1.2 °C | 13.3 °C | 21.34 mm |
| November | -8.6 °C | 3.8 °C | 12.7 mm |
| December | -14.6 °C | -3 °C | 9.91 mm |
| Annual | -1.9 °C | 12.3 °C | 344.17 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |