Herndon, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.4 °F (low) to 65.8 °F (high). Annual precipitation averages 20.8 Inches. Herndon is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.8 °F | 41.4 °F | 0.42 in. |
| February | 17.2 °F | 44.6 °F | 0.59 in. |
| March | 25.6 °F | 55.6 °F | 1.01 in. |
| April | 34.9 °F | 64.5 °F | 2.04 in. |
| May | 46.4 °F | 74.1 °F | 3.03 in. |
| June | 57.4 °F | 85.6 °F | 2.97 in. |
| July | 63.1 °F | 91.1 °F | 3.31 in. |
| August | 60.7 °F | 88.5 °F | 2.91 in. |
| September | 50.8 °F | 81.0 °F | 1.66 in. |
| October | 36.8 °F | 67.5 °F | 1.51 in. |
| November | 24.5 °F | 53.6 °F | 0.72 in. |
| December | 16.2 °F | 42.5 °F | 0.59 in. |
| Annual | 37.4 °F | 65.8 °F | 20.76 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |