Andrew, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 14.2 °C (high). Annual precipitation averages 934.5 Millimeters. Andrew is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -2.4 °C | 34.29 mm |
| February | -9.8 °C | 0 °C | 39.62 mm |
| March | -3.6 °C | 7.2 °C | 55.63 mm |
| April | 2.5 °C | 14.8 °C | 93.22 mm |
| May | 9.1 °C | 21.2 °C | 105.41 mm |
| June | 14.9 °C | 26.3 °C | 135.89 mm |
| July | 16.7 °C | 28.1 °C | 112.27 mm |
| August | 15.4 °C | 27.1 °C | 101.6 mm |
| September | 10.5 °C | 23.6 °C | 83.31 mm |
| October | 3.9 °C | 16.4 °C | 76.2 mm |
| November | -2.4 °C | 7.8 °C | 53.85 mm |
| December | -8.3 °C | 0.7 °C | 43.18 mm |
| Annual | 3.1 °C | 14.2 °C | 934.47 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |