Melvern, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 19.1 °C (high). Annual precipitation averages 966 Millimeters. Melvern 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 | -6.4 °C | 4.8 °C | 24.64 mm |
| February | -4.3 °C | 7.4 °C | 36.32 mm |
| March | 0.9 °C | 13.7 °C | 60.71 mm |
| April | 6.4 °C | 19.1 °C | 92.71 mm |
| May | 12.7 °C | 24.1 °C | 143.26 mm |
| June | 18.1 °C | 29.3 °C | 127.76 mm |
| July | 20.3 °C | 32 °C | 109.98 mm |
| August | 19.2 °C | 31.4 °C | 97.79 mm |
| September | 14.4 °C | 27.1 °C | 101.6 mm |
| October | 7.5 °C | 20.8 °C | 80.77 mm |
| November | 1.3 °C | 13.3 °C | 53.85 mm |
| December | -4.1 °C | 6.7 °C | 36.58 mm |
| Annual | 7.2 °C | 19.1 °C | 965.97 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 6b : -20.6°C to -17.8°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 |