Poplar, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 10.6 °C (high). Annual precipitation averages 820.9 Millimeters. Poplar 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.4 °C | -6.3 °C | 28.45 mm |
| February | -14.8 °C | -3.3 °C | 25.91 mm |
| March | -8.6 °C | 3.1 °C | 41.15 mm |
| April | -1.9 °C | 10 °C | 70.1 mm |
| May | 3.9 °C | 17.7 °C | 88.14 mm |
| June | 9.3 °C | 22.7 °C | 107.19 mm |
| July | 12.9 °C | 25.7 °C | 106.43 mm |
| August | 12.7 °C | 24.7 °C | 96.27 mm |
| September | 8.3 °C | 20.1 °C | 87.12 mm |
| October | 2.2 °C | 12.3 °C | 79.5 mm |
| November | -4.7 °C | 3.8 °C | 51.31 mm |
| December | -11.9 °C | -3.4 °C | 39.37 mm |
| Annual | -0.8 °C | 10.6 °C | 820.94 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |