Allen, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 65.9 °F (high). Annual precipitation averages 36.4 Inches. Allen is located in USDA Plant Hardiness Zone 6b. 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 | 18.8 °F | 40.0 °F | 0.87 in. |
| February | 22.2 °F | 44.9 °F | 1.32 in. |
| March | 32.1 °F | 56.1 °F | 2.36 in. |
| April | 42.1 °F | 66.1 °F | 3.48 in. |
| May | 53.7 °F | 75.0 °F | 5.31 in. |
| June | 63.4 °F | 84.4 °F | 4.8 in. |
| July | 67.7 °F | 89.5 °F | 4.51 in. |
| August | 65.7 °F | 88.3 °F | 4.16 in. |
| September | 57.0 °F | 80.5 °F | 3.52 in. |
| October | 44.1 °F | 68.3 °F | 2.78 in. |
| November | 32.6 °F | 55.0 °F | 1.86 in. |
| December | 22.8 °F | 43.2 °F | 1.43 in. |
| Annual | 43.5 °F | 65.9 °F | 36.4 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |