Poplar, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.7 °F (low) to 51.1 °F (high). Annual precipitation averages 32.3 Inches. 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 | 2.5 °F | 20.7 °F | 1.12 in. |
| February | 5.4 °F | 26.1 °F | 1.02 in. |
| March | 16.6 °F | 37.5 °F | 1.62 in. |
| April | 28.6 °F | 50.0 °F | 2.76 in. |
| May | 39.1 °F | 63.8 °F | 3.47 in. |
| June | 48.8 °F | 72.9 °F | 4.22 in. |
| July | 55.3 °F | 78.3 °F | 4.19 in. |
| August | 54.8 °F | 76.5 °F | 3.79 in. |
| September | 46.9 °F | 68.2 °F | 3.43 in. |
| October | 35.9 °F | 54.2 °F | 3.13 in. |
| November | 23.5 °F | 38.8 °F | 2.02 in. |
| December | 10.5 °F | 25.8 °F | 1.55 in. |
| Annual | 30.7 °F | 51.1 °F | 32.32 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |