Marquette, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.3 °F (low) to 57.8 °F (high). Annual precipitation averages 37.5 Inches. Marquette is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.0 °F | 27.5 °F | 1.22 in. |
| February | 13.6 °F | 32.2 °F | 1.23 in. |
| March | 24.9 °F | 44.7 °F | 2.0 in. |
| April | 36.2 °F | 58.7 °F | 3.97 in. |
| May | 47.7 °F | 70.3 °F | 4.71 in. |
| June | 57.9 °F | 79.8 °F | 5.78 in. |
| July | 62.1 °F | 83.4 °F | 4.19 in. |
| August | 60.0 °F | 81.6 °F | 4.1 in. |
| September | 51.4 °F | 74.7 °F | 3.93 in. |
| October | 39.4 °F | 61.7 °F | 2.77 in. |
| November | 27.5 °F | 45.8 °F | 2.07 in. |
| December | 17.1 °F | 33.1 °F | 1.55 in. |
| Annual | 37.3 °F | 57.8 °F | 37.52 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |