Pendroy, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.1 °F (low) to 54.2 °F (high). Annual precipitation averages 15.8 Inches. Pendroy is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °F | 34.2 °F | 0.52 in. |
| February | 14.1 °F | 35.4 °F | 0.62 in. |
| March | 20.4 °F | 42.6 °F | 0.8 in. |
| April | 28.0 °F | 51.6 °F | 1.71 in. |
| May | 36.4 °F | 61.0 °F | 2.6 in. |
| June | 43.5 °F | 68.3 °F | 3.12 in. |
| July | 49.0 °F | 79.1 °F | 1.24 in. |
| August | 47.7 °F | 78.5 °F | 1.33 in. |
| September | 40.2 °F | 68.3 °F | 1.6 in. |
| October | 31.0 °F | 55.0 °F | 1.02 in. |
| November | 22.4 °F | 42.1 °F | 0.7 in. |
| December | 15.0 °F | 34.3 °F | 0.49 in. |
| Annual | 30.1 °F | 54.2 °F | 15.75 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |