| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51f - Green Bay Till and Lacustrine Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54159 - Porterfield, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 9 | 20 | 32 | 43 | 52 | 57 | 56 | 48 | 37 | 26 | 13 | 33 |
| Avg Max Temp (°F) | 24 | 29 | 39 | 53 | 66 | 76 | 81 | 78 | 69 | 57 | 42 | 29 | 54 |
| Avg Precip (In.) | 1.75 | 1.14 | 2.18 | 2.63 | 3.17 | 3.55 | 3.54 | 3.59 | 3.54 | 2.52 | 2.56 | 1.71 | 31.88 |