Walker, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.6 °C (low) to 19.5 °C (high). Annual precipitation averages 1151.9 Millimeters. Walker is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 5.6 °C | 43.94 mm |
| February | -3.4 °C | 8.5 °C | 51.31 mm |
| March | 1.5 °C | 14.1 °C | 80.01 mm |
| April | 6.9 °C | 19.6 °C | 123.7 mm |
| May | 12.7 °C | 24.3 °C | 161.04 mm |
| June | 18.1 °C | 29.3 °C | 138.43 mm |
| July | 20.4 °C | 31.9 °C | 113.54 mm |
| August | 19.2 °C | 31.5 °C | 96.27 mm |
| September | 14.4 °C | 27.2 °C | 114.05 mm |
| October | 7.8 °C | 21.1 °C | 89.92 mm |
| November | 1.7 °C | 13.8 °C | 78.99 mm |
| December | -3.1 °C | 7.6 °C | 60.71 mm |
| Annual | 7.6 °C | 19.5 °C | 1151.91 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |