Marquette, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.4 °C (low) to 9.9 °C (high). Annual precipitation averages 766.8 Millimeters. 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 | -11.3 °C | -3.9 °C | 46.74 mm |
| February | -11.4 °C | -2.8 °C | 38.86 mm |
| March | -7 °C | 2.1 °C | 43.43 mm |
| April | -0.9 °C | 7.3 °C | 65.53 mm |
| May | 4.7 °C | 14.4 °C | 70.36 mm |
| June | 9.8 °C | 19.8 °C | 74.17 mm |
| July | 14 °C | 23.2 °C | 67.82 mm |
| August | 14 °C | 23.1 °C | 66.29 mm |
| September | 10.2 °C | 19.3 °C | 86.36 mm |
| October | 4 °C | 12 °C | 97.03 mm |
| November | -1.8 °C | 4.9 °C | 59.94 mm |
| December | -7.4 °C | -1 °C | 50.29 mm |
| Annual | 1.4 °C | 9.9 °C | 766.82 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |