| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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: | 50k - Wisconsin/Michigan Pine Barrens |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54143 - Marinette, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 12 | 22 | 33 | 45 | 54 | 60 | 58 | 50 | 39 | 27 | 15 | 35 |
| Avg Max Temp (°F) | 25 | 29 | 39 | 52 | 65 | 76 | 81 | 78 | 70 | 57 | 43 | 30 | 54 |
| Avg Precip (In.) | 1.98 | 1.31 | 2.37 | 2.73 | 3.06 | 3.57 | 3.46 | 3.37 | 3.52 | 2.46 | 2.67 | 1.78 | 32.31 |