Alta Vista, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.9 °C (low) to 13 °C (high). Annual precipitation averages 960.1 Millimeters. 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 | -13.8 °C | -4.3 °C | 22.86 mm |
| February | -11.7 °C | -1.9 °C | 26.67 mm |
| March | -5.1 °C | 5.2 °C | 46.23 mm |
| April | 1.4 °C | 13.7 °C | 96.01 mm |
| May | 8.2 °C | 20.4 °C | 129.79 mm |
| June | 14 °C | 25.7 °C | 156.97 mm |
| July | 15.9 °C | 27.4 °C | 114.81 mm |
| August | 14.4 °C | 26.3 °C | 110.74 mm |
| September | 9.8 °C | 22.9 °C | 100.58 mm |
| October | 3 °C | 15.4 °C | 75.95 mm |
| November | -3.7 °C | 6.3 °C | 42.93 mm |
| December | -10 °C | -1.3 °C | 36.58 mm |
| Annual | 1.9 °C | 13 °C | 960.12 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |