Porterfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.2 °F (low) to 53.7 °F (high). Annual precipitation averages 32.4 Inches. 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 | 7.4 °F | 25.5 °F | 1.49 in. |
| February | 8.6 °F | 28.8 °F | 1.13 in. |
| March | 18.7 °F | 39.5 °F | 1.8 in. |
| April | 30.8 °F | 51.9 °F | 3.0 in. |
| May | 42.5 °F | 65.6 °F | 3.44 in. |
| June | 52.6 °F | 75.1 °F | 3.92 in. |
| July | 57.1 °F | 79.7 °F | 3.69 in. |
| August | 55.5 °F | 77.8 °F | 3.31 in. |
| September | 47.8 °F | 70.2 °F | 3.48 in. |
| October | 36.7 °F | 56.7 °F | 3.2 in. |
| November | 26.1 °F | 42.9 °F | 2.13 in. |
| December | 15.0 °F | 30.6 °F | 1.79 in. |
| Annual | 33.2 °F | 53.7 °F | 32.38 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |