La Harpe, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 19.2 °C (high). Annual precipitation averages 1080.8 Millimeters. La Harpe 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 | -6.1 °C | 5.4 °C | 34.04 mm |
| February | -4.1 °C | 8 °C | 42.42 mm |
| March | 1.1 °C | 13.9 °C | 72.39 mm |
| April | 6.5 °C | 19.3 °C | 112.52 mm |
| May | 12.7 °C | 23.8 °C | 150.37 mm |
| June | 18 °C | 28.9 °C | 139.7 mm |
| July | 20.3 °C | 31.6 °C | 113.03 mm |
| August | 19.2 °C | 31.2 °C | 105.66 mm |
| September | 14.5 °C | 27.2 °C | 111.25 mm |
| October | 7.6 °C | 20.7 °C | 91.69 mm |
| November | 1.3 °C | 13.5 °C | 61.21 mm |
| December | -3.9 °C | 7.1 °C | 46.48 mm |
| Annual | 7.3 °C | 19.2 °C | 1080.76 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |