Effingham, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 18.3 °C (high). Annual precipitation averages 940.6 Millimeters. Effingham is located in USDA Plant Hardiness Zone 6a. 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 | -7.8 °C | 3.1 °C | 20.57 mm |
| February | -5.8 °C | 6.1 °C | 33.53 mm |
| March | -0.3 °C | 12.7 °C | 54.86 mm |
| April | 5.6 °C | 18.5 °C | 93.98 mm |
| May | 12.1 °C | 23.9 °C | 125.73 mm |
| June | 17.7 °C | 29.1 °C | 128.78 mm |
| July | 19.9 °C | 31.4 °C | 129.79 mm |
| August | 18.7 °C | 30.7 °C | 99.82 mm |
| September | 13.4 °C | 26.6 °C | 94.23 mm |
| October | 6.8 °C | 19.9 °C | 74.93 mm |
| November | 0.1 °C | 12.1 °C | 46.99 mm |
| December | -5.1 °C | 5.3 °C | 37.34 mm |
| Annual | 6.3 °C | 18.3 °C | 940.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |