Mapleton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.9 °C (low) to 15.5 °C (high). Annual precipitation averages 804.9 Millimeters. Mapleton 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 | -12.1 °C | -1.5 °C | 18.03 mm |
| February | -9.8 °C | 1.3 °C | 23.11 mm |
| March | -3.7 °C | 8.7 °C | 43.43 mm |
| April | 2.2 °C | 16.3 °C | 85.09 mm |
| May | 9.1 °C | 22.3 °C | 113.54 mm |
| June | 15.2 °C | 27.8 °C | 118.87 mm |
| July | 17.2 °C | 29.7 °C | 99.82 mm |
| August | 15.7 °C | 28.4 °C | 104.65 mm |
| September | 10.7 °C | 25.1 °C | 78.49 mm |
| October | 3.5 °C | 17.7 °C | 55.88 mm |
| November | -3.7 °C | 8.8 °C | 35.05 mm |
| December | -9.2 °C | 1.2 °C | 28.96 mm |
| Annual | 2.9 °C | 15.5 °C | 804.92 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |