| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50w - Michigamme Highland |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49849 - Ishpeming, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 7 | 16 | 28 | 40 | 49 | 54 | 52 | 45 | 35 | 23 | 11 | 30 |
| Avg Max Temp (°F) | 21 | 27 | 36 | 50 | 65 | 73 | 77 | 75 | 66 | 54 | 38 | 26 | 51 |
| Avg Precip (In.) | 2.36 | 1.67 | 2.91 | 2.68 | 3.05 | 3.31 | 3.25 | 3.56 | 3.75 | 3.5 | 3.07 | 2.25 | 35.35 |