Mount Pleasant, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.2 °C (high). Annual precipitation averages 959.1 Millimeters. Mount Pleasant is located in USDA Plant Hardiness Zone 5b. 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 | -9.2 °C | -0.1 °C | 36.58 mm |
| February | -7.2 °C | 2.5 °C | 43.43 mm |
| March | -1.4 °C | 9.6 °C | 61.21 mm |
| April | 4.7 °C | 16.9 °C | 93.73 mm |
| May | 11.2 °C | 22.7 °C | 129.54 mm |
| June | 16.6 °C | 27.8 °C | 124.97 mm |
| July | 18.6 °C | 29.7 °C | 105.66 mm |
| August | 17.3 °C | 28.9 °C | 98.3 mm |
| September | 12.4 °C | 25.3 °C | 93.22 mm |
| October | 6.1 °C | 18.2 °C | 72.39 mm |
| November | -0.3 °C | 9.8 °C | 55.88 mm |
| December | -5.9 °C | 2.8 °C | 44.2 mm |
| Annual | 5.2 °C | 16.2 °C | 959.11 mm |
| 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 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 |