Marysville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 15.7 °C (high). Annual precipitation averages 942.6 Millimeters. Marysville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | -1.2 °C | 28.19 mm |
| February | -8.6 °C | 1.5 °C | 37.34 mm |
| March | -2.6 °C | 9.3 °C | 54.1 mm |
| April | 4.2 °C | 16.4 °C | 98.3 mm |
| May | 10.9 °C | 22.2 °C | 132.08 mm |
| June | 16.8 °C | 27.8 °C | 130.81 mm |
| July | 18.2 °C | 29.9 °C | 108.97 mm |
| August | 17.3 °C | 28.6 °C | 105.92 mm |
| September | 12.2 °C | 24.7 °C | 91.95 mm |
| October | 5.2 °C | 17.7 °C | 66.8 mm |
| November | -1.3 °C | 8.9 °C | 52.07 mm |
| December | -7.4 °C | 2.2 °C | 36.07 mm |
| Annual | 4.5 °C | 15.7 °C | 942.6 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |