Andrew, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.6 °F (low) to 57.6 °F (high). Annual precipitation averages 36.8 Inches. 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 | 10.6 °F | 27.6 °F | 1.35 in. |
| February | 14.3 °F | 32.0 °F | 1.56 in. |
| March | 25.6 °F | 45.0 °F | 2.19 in. |
| April | 36.5 °F | 58.6 °F | 3.67 in. |
| May | 48.4 °F | 70.1 °F | 4.15 in. |
| June | 58.8 °F | 79.4 °F | 5.35 in. |
| July | 62.0 °F | 82.5 °F | 4.42 in. |
| August | 59.7 °F | 80.8 °F | 4.0 in. |
| September | 50.9 °F | 74.4 °F | 3.28 in. |
| October | 39.1 °F | 61.5 °F | 3.0 in. |
| November | 27.6 °F | 46.1 °F | 2.12 in. |
| December | 17.1 °F | 33.2 °F | 1.7 in. |
| Annual | 37.6 °F | 57.6 °F | 36.79 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |