Allendale, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.9 °F (low) to 61.6 °F (high). Annual precipitation averages 38.5 Inches. Allendale is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.3 °F | 33.0 °F | 0.9 in. |
| February | 18.8 °F | 38.3 °F | 1.33 in. |
| March | 29.1 °F | 50.7 °F | 2.24 in. |
| April | 39.8 °F | 62.4 °F | 3.91 in. |
| May | 51.6 °F | 72.4 °F | 5.54 in. |
| June | 61.3 °F | 81.5 °F | 5.37 in. |
| July | 65.6 °F | 86.1 °F | 4.74 in. |
| August | 63.3 °F | 84.5 °F | 4.21 in. |
| September | 54.3 °F | 77.3 °F | 3.78 in. |
| October | 42.1 °F | 65.0 °F | 3.04 in. |
| November | 30.3 °F | 50.1 °F | 1.99 in. |
| December | 20.0 °F | 37.7 °F | 1.44 in. |
| Annual | 40.9 °F | 61.6 °F | 38.49 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |