Seneca, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 17.7 °C (high). Annual precipitation averages 869.2 Millimeters. Seneca is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.8 °C | 2.3 °C | 19.05 mm |
| February | -6.7 °C | 5.2 °C | 27.69 mm |
| March | -1.1 °C | 12 °C | 54.1 mm |
| April | 4.7 °C | 17.9 °C | 85.6 mm |
| May | 11.4 °C | 23.5 °C | 125.48 mm |
| June | 17.1 °C | 28.8 °C | 117.6 mm |
| July | 19.2 °C | 31.1 °C | 116.59 mm |
| August | 17.9 °C | 30.3 °C | 95.25 mm |
| September | 12.6 °C | 26.3 °C | 86.11 mm |
| October | 5.8 °C | 19.6 °C | 68.33 mm |
| November | -0.9 °C | 11.3 °C | 43.94 mm |
| December | -6.1 °C | 4.6 °C | 29.46 mm |
| Annual | 5.4 °C | 17.7 °C | 869.2 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |