Negaunee, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30 °F (low) to 50.3 °F (high). Annual precipitation averages 32.5 Inches. Negaunee 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.4 °F | 22.3 °F | 1.73 in. |
| February | 5.6 °F | 25.5 °F | 1.51 in. |
| March | 13.5 °F | 36.1 °F | 1.81 in. |
| April | 26.1 °F | 47.3 °F | 2.7 in. |
| May | 38.6 °F | 62.0 °F | 3.15 in. |
| June | 48.6 °F | 72.2 °F | 3.38 in. |
| July | 53.3 °F | 76.8 °F | 3.6 in. |
| August | 51.7 °F | 75.1 °F | 2.9 in. |
| September | 44.9 °F | 67.3 °F | 3.66 in. |
| October | 34.0 °F | 52.6 °F | 3.78 in. |
| November | 24.0 °F | 38.7 °F | 2.18 in. |
| December | 13.1 °F | 27.4 °F | 2.05 in. |
| Annual | 30 °F | 50.3 °F | 32.45 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |