Marquette, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.5 °F (low) to 49.7 °F (high). Annual precipitation averages 30.2 Inches. Marquette is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.7 °F | 24.9 °F | 1.84 in. |
| February | 11.4 °F | 27.0 °F | 1.53 in. |
| March | 19.4 °F | 35.7 °F | 1.71 in. |
| April | 30.4 °F | 45.1 °F | 2.58 in. |
| May | 40.5 °F | 57.9 °F | 2.77 in. |
| June | 49.7 °F | 67.6 °F | 2.92 in. |
| July | 57.2 °F | 73.7 °F | 2.67 in. |
| August | 57.2 °F | 73.5 °F | 2.61 in. |
| September | 50.3 °F | 66.8 °F | 3.4 in. |
| October | 39.2 °F | 53.6 °F | 3.82 in. |
| November | 28.7 °F | 40.9 °F | 2.36 in. |
| December | 18.6 °F | 30.2 °F | 1.98 in. |
| Annual | 34.5 °F | 49.7 °F | 30.19 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |