Sedan, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.5 °F (low) to 69.4 °F (high). Annual precipitation averages 40.9 Inches. Sedan is located in USDA Plant Hardiness Zone 7a. 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 | 22.9 °F | 45.4 °F | 1.35 in. |
| February | 26.3 °F | 50.1 °F | 1.72 in. |
| March | 35.4 °F | 60.0 °F | 2.86 in. |
| April | 45.6 °F | 69.3 °F | 4.33 in. |
| May | 56.2 °F | 77.1 °F | 6.0 in. |
| June | 65.5 °F | 85.8 °F | 5.69 in. |
| July | 69.8 °F | 91.3 °F | 4.0 in. |
| August | 67.8 °F | 90.9 °F | 3.64 in. |
| September | 59.3 °F | 83.2 °F | 3.52 in. |
| October | 46.9 °F | 72.0 °F | 3.85 in. |
| November | 35.6 °F | 59.4 °F | 2.15 in. |
| December | 26.1 °F | 48.0 °F | 1.82 in. |
| Annual | 46.5 °F | 69.4 °F | 40.93 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |