Mediapolis, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 16 °C (high). Annual precipitation averages 959.9 Millimeters. Mediapolis 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | -0.3 °C | 38.1 mm |
| February | -7.2 °C | 2.4 °C | 44.96 mm |
| March | -1.6 °C | 9.6 °C | 62.99 mm |
| April | 4.4 °C | 16.7 °C | 94.49 mm |
| May | 11.1 °C | 22.6 °C | 127.25 mm |
| June | 16.3 °C | 27.7 °C | 122.43 mm |
| July | 18.3 °C | 29.4 °C | 100.84 mm |
| August | 17.1 °C | 28.6 °C | 98.55 mm |
| September | 12.4 °C | 25.3 °C | 91.19 mm |
| October | 5.9 °C | 18.2 °C | 72.9 mm |
| November | -0.6 °C | 9.6 °C | 59.44 mm |
| December | -5.9 °C | 2.7 °C | 46.74 mm |
| Annual | 5.1 °C | 16 °C | 959.88 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |