Ishpeming, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.4 °F (low) to 50.4 °F (high). Annual precipitation averages 32.2 Inches. 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 | 5.5 °F | 22.2 °F | 1.68 in. |
| February | 4.9 °F | 25.5 °F | 1.45 in. |
| March | 12.9 °F | 36.4 °F | 1.74 in. |
| April | 25.7 °F | 47.6 °F | 2.61 in. |
| May | 38.2 °F | 62.3 °F | 3.13 in. |
| June | 48.2 °F | 72.3 °F | 3.42 in. |
| July | 52.8 °F | 77.0 °F | 3.83 in. |
| August | 51.2 °F | 75.3 °F | 2.87 in. |
| September | 44.3 °F | 67.4 °F | 3.64 in. |
| October | 33.5 °F | 52.6 °F | 3.72 in. |
| November | 23.5 °F | 38.6 °F | 2.13 in. |
| December | 12.3 °F | 27.2 °F | 2.02 in. |
| Annual | 29.4 °F | 50.4 °F | 32.24 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |