Mineola, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 16.4 °C (high). Annual precipitation averages 855.2 Millimeters. Mineola 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 | -10.4 °C | 0.2 °C | 20.07 mm |
| February | -8.2 °C | 2.9 °C | 25.4 mm |
| March | -2.2 °C | 10.2 °C | 45.97 mm |
| April | 3.8 °C | 17.1 °C | 86.61 mm |
| May | 10.6 °C | 22.7 °C | 133.6 mm |
| June | 16.4 °C | 28.2 °C | 130.05 mm |
| July | 18.8 °C | 30.1 °C | 95 mm |
| August | 17.3 °C | 29.2 °C | 98.55 mm |
| September | 12 °C | 25.6 °C | 81.03 mm |
| October | 5.1 °C | 18.4 °C | 67.82 mm |
| November | -2 °C | 9.7 °C | 38.86 mm |
| December | -7.5 °C | 2.7 °C | 32.26 mm |
| Annual | 4.5 °C | 16.4 °C | 855.22 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |