Atalissa, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.1 °F (high). Annual precipitation averages 37.9 Inches. 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 | 14.1 °F | 30.3 °F | 1.35 in. |
| February | 17.6 °F | 34.8 °F | 1.62 in. |
| March | 28.4 °F | 47.7 °F | 2.38 in. |
| April | 39.6 °F | 61.4 °F | 3.69 in. |
| May | 51.4 °F | 72.2 °F | 4.82 in. |
| June | 61.4 °F | 81.5 °F | 5.14 in. |
| July | 64.9 °F | 84.7 °F | 4.25 in. |
| August | 62.5 °F | 82.9 °F | 4.11 in. |
| September | 54.1 °F | 77.0 °F | 3.57 in. |
| October | 42.2 °F | 63.9 °F | 2.92 in. |
| November | 30.4 °F | 48.8 °F | 2.2 in. |
| December | 20.0 °F | 35.5 °F | 1.81 in. |
| Annual | 40.6 °F | 60.1 °F | 37.86 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |