Poplar, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 29.4 °F (low) to 56.5 °F (high). Annual precipitation averages 13.9 Inches. Poplar 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °F | 23.7 °F | 0.29 in. |
| February | 5.4 °F | 29.2 °F | 0.25 in. |
| March | 17.6 °F | 42.6 °F | 0.41 in. |
| April | 29.4 °F | 58.1 °F | 0.94 in. |
| May | 40.3 °F | 69.5 °F | 2.15 in. |
| June | 50.7 °F | 78.3 °F | 2.92 in. |
| July | 55.7 °F | 86.4 °F | 2.63 in. |
| August | 53.5 °F | 86.6 °F | 1.54 in. |
| September | 43.3 °F | 75.5 °F | 1.21 in. |
| October | 30.8 °F | 58.8 °F | 0.82 in. |
| November | 17.6 °F | 41.0 °F | 0.37 in. |
| December | 6.1 °F | 28.0 °F | 0.34 in. |
| Annual | 29.4 °F | 56.5 °F | 13.87 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |