Marysville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 60.2 °F (high). Annual precipitation averages 37.1 Inches. 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 | 12.9 °F | 29.8 °F | 1.11 in. |
| February | 16.6 °F | 34.7 °F | 1.47 in. |
| March | 27.3 °F | 48.8 °F | 2.13 in. |
| April | 39.6 °F | 61.6 °F | 3.87 in. |
| May | 51.6 °F | 71.9 °F | 5.2 in. |
| June | 62.3 °F | 82.1 °F | 5.15 in. |
| July | 64.8 °F | 85.9 °F | 4.29 in. |
| August | 63.2 °F | 83.4 °F | 4.17 in. |
| September | 54.0 °F | 76.5 °F | 3.62 in. |
| October | 41.4 °F | 63.9 °F | 2.63 in. |
| November | 29.7 °F | 48.1 °F | 2.05 in. |
| December | 18.7 °F | 36.0 °F | 1.42 in. |
| Annual | 40.2 °F | 60.2 °F | 37.11 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |