Poplar, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.5 °C (low) to 13.6 °C (high). Annual precipitation averages 352.3 Millimeters. 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 | -16.8 °C | -4.6 °C | 7.37 mm |
| February | -14.8 °C | -1.6 °C | 6.35 mm |
| March | -8 °C | 5.9 °C | 10.41 mm |
| April | -1.4 °C | 14.5 °C | 23.88 mm |
| May | 4.6 °C | 20.8 °C | 54.61 mm |
| June | 10.4 °C | 25.7 °C | 74.17 mm |
| July | 13.2 °C | 30.2 °C | 66.8 mm |
| August | 11.9 °C | 30.3 °C | 39.12 mm |
| September | 6.3 °C | 24.2 °C | 30.73 mm |
| October | -0.7 °C | 14.9 °C | 20.83 mm |
| November | -8 °C | 5 °C | 9.4 mm |
| December | -14.4 °C | -2.2 °C | 8.64 mm |
| Annual | -1.5 °C | 13.6 °C | 352.31 mm |
| 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 : -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 |