Atalissa, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 15.6 °C (high). Annual precipitation averages 961.7 Millimeters. Atalissa 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 | -9.9 °C | -0.9 °C | 34.29 mm |
| February | -8 °C | 1.6 °C | 41.15 mm |
| March | -2 °C | 8.7 °C | 60.45 mm |
| April | 4.2 °C | 16.3 °C | 93.73 mm |
| May | 10.8 °C | 22.3 °C | 122.43 mm |
| June | 16.3 °C | 27.5 °C | 130.56 mm |
| July | 18.3 °C | 29.3 °C | 107.95 mm |
| August | 16.9 °C | 28.3 °C | 104.39 mm |
| September | 12.3 °C | 25 °C | 90.68 mm |
| October | 5.7 °C | 17.7 °C | 74.17 mm |
| November | -0.9 °C | 9.3 °C | 55.88 mm |
| December | -6.7 °C | 1.9 °C | 45.97 mm |
| Annual | 4.8 °C | 15.6 °C | 961.65 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |