Mechanicsville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 58.2 °F (high). Annual precipitation averages 38.4 Inches. Mechanicsville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.2 °F | 28.1 °F | 1.32 in. |
| February | 14.8 °F | 32.6 °F | 1.54 in. |
| March | 26.0 °F | 45.7 °F | 2.3 in. |
| April | 37.0 °F | 59.7 °F | 3.77 in. |
| May | 48.8 °F | 70.6 °F | 4.64 in. |
| June | 59.0 °F | 79.9 °F | 5.32 in. |
| July | 62.3 °F | 82.9 °F | 4.44 in. |
| August | 59.9 °F | 81.2 °F | 4.35 in. |
| September | 51.3 °F | 75.1 °F | 3.69 in. |
| October | 39.5 °F | 62.2 °F | 3.02 in. |
| November | 27.7 °F | 46.8 °F | 2.25 in. |
| December | 17.4 °F | 33.6 °F | 1.73 in. |
| Annual | 37.9 °F | 58.2 °F | 38.37 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |