Ishpeming, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.4 °C (low) to 10.2 °C (high). Annual precipitation averages 818.9 Millimeters. Ishpeming is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.7 °C | -5.4 °C | 42.67 mm |
| February | -15.1 °C | -3.6 °C | 36.83 mm |
| March | -10.6 °C | 2.4 °C | 44.2 mm |
| April | -3.5 °C | 8.7 °C | 66.29 mm |
| May | 3.4 °C | 16.8 °C | 79.5 mm |
| June | 9 °C | 22.4 °C | 86.87 mm |
| July | 11.6 °C | 25 °C | 97.28 mm |
| August | 10.7 °C | 24.1 °C | 72.9 mm |
| September | 6.8 °C | 19.7 °C | 92.46 mm |
| October | 0.8 °C | 11.4 °C | 94.49 mm |
| November | -4.7 °C | 3.7 °C | 54.1 mm |
| December | -10.9 °C | -2.7 °C | 51.31 mm |
| Annual | -1.4 °C | 10.2 °C | 818.9 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |