Walker, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 14.4 °C (high). Annual precipitation averages 968.5 Millimeters. Walker 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 | -12.2 °C | -2.7 °C | 29.72 mm |
| February | -10.1 °C | -0.3 °C | 32.51 mm |
| March | -3.7 °C | 7.1 °C | 52.32 mm |
| April | 2.6 °C | 15.2 °C | 95.5 mm |
| May | 9.2 °C | 21.6 °C | 119.13 mm |
| June | 15 °C | 26.8 °C | 148.34 mm |
| July | 16.8 °C | 28.5 °C | 113.54 mm |
| August | 15.4 °C | 27.4 °C | 112.27 mm |
| September | 10.6 °C | 24.1 °C | 95.25 mm |
| October | 4 °C | 16.7 °C | 74.42 mm |
| November | -2.7 °C | 7.8 °C | 54.86 mm |
| December | -8.6 °C | 0.4 °C | 40.64 mm |
| Annual | 3 °C | 14.4 °C | 968.5 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 |