Delphos, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 67.1 °F (high). Annual precipitation averages 29.5 Inches. Delphos is located in USDA Plant Hardiness Zone 6b. 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 | 18.9 °F | 40.4 °F | 0.72 in. |
| February | 22.2 °F | 45.2 °F | 0.98 in. |
| March | 31.6 °F | 56.6 °F | 1.67 in. |
| April | 41.4 °F | 66.9 °F | 2.5 in. |
| May | 52.8 °F | 76.4 °F | 4.58 in. |
| June | 63.7 °F | 87.5 °F | 4.13 in. |
| July | 68.6 °F | 92.7 °F | 4.3 in. |
| August | 66.3 °F | 90.1 °F | 3.69 in. |
| September | 57.3 °F | 82.5 °F | 2.66 in. |
| October | 44.1 °F | 69.8 °F | 1.97 in. |
| November | 31.5 °F | 54.8 °F | 1.18 in. |
| December | 22.1 °F | 42.8 °F | 1.07 in. |
| Annual | 43.4 °F | 67.1 °F | 29.45 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |