Alta Vista, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.4 °F (low) to 55.4 °F (high). Annual precipitation averages 37.8 Inches. Alta Vista is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °F | 24.2 °F | 0.9 in. |
| February | 10.9 °F | 28.5 °F | 1.05 in. |
| March | 22.9 °F | 41.4 °F | 1.82 in. |
| April | 34.5 °F | 56.6 °F | 3.78 in. |
| May | 46.7 °F | 68.7 °F | 5.11 in. |
| June | 57.2 °F | 78.2 °F | 6.18 in. |
| July | 60.6 °F | 81.4 °F | 4.52 in. |
| August | 58.0 °F | 79.4 °F | 4.36 in. |
| September | 49.6 °F | 73.3 °F | 3.96 in. |
| October | 37.4 °F | 59.8 °F | 2.99 in. |
| November | 25.3 °F | 43.3 °F | 1.69 in. |
| December | 14.0 °F | 29.7 °F | 1.44 in. |
| Annual | 35.4 °F | 55.4 °F | 37.8 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |