Porterfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 12.1 °C (high). Annual precipitation averages 822.5 Millimeters. Porterfield is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.7 °C | -3.6 °C | 37.85 mm |
| February | -13 °C | -1.8 °C | 28.7 mm |
| March | -7.4 °C | 4.2 °C | 45.72 mm |
| April | -0.7 °C | 11.1 °C | 76.2 mm |
| May | 5.8 °C | 18.7 °C | 87.38 mm |
| June | 11.4 °C | 23.9 °C | 99.57 mm |
| July | 13.9 °C | 26.5 °C | 93.73 mm |
| August | 13.1 °C | 25.4 °C | 84.07 mm |
| September | 8.8 °C | 21.2 °C | 88.39 mm |
| October | 2.6 °C | 13.7 °C | 81.28 mm |
| November | -3.3 °C | 6.1 °C | 54.1 mm |
| December | -9.4 °C | -0.8 °C | 45.47 mm |
| Annual | 0.7 °C | 12.1 °C | 822.46 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |