Power, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.1 °C (low) to 14 °C (high). Annual precipitation averages 302.8 Millimeters. Power is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 2.2 °C | 8.89 mm |
| February | -9.2 °C | 3.3 °C | 8.64 mm |
| March | -5.4 °C | 7.7 °C | 12.19 mm |
| April | -0.9 °C | 12.7 °C | 33.53 mm |
| May | 3.9 °C | 17.8 °C | 51.05 mm |
| June | 8.1 °C | 22.3 °C | 66.55 mm |
| July | 11 °C | 28.4 °C | 26.67 mm |
| August | 10.2 °C | 27.9 °C | 27.43 mm |
| September | 6 °C | 22.1 °C | 28.45 mm |
| October | 0.6 °C | 14.3 °C | 19.81 mm |
| November | -4.6 °C | 7 °C | 11.18 mm |
| December | -8.7 °C | 2.4 °C | 8.38 mm |
| Annual | 0.1 °C | 14 °C | 302.77 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |