Derby, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.8 °F (low) to 67.9 °F (high). Annual precipitation averages 37 Inches. Derby is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.2 °F | 43.1 °F | 0.88 in. |
| February | 25.3 °F | 47.9 °F | 1.4 in. |
| March | 34.5 °F | 58.2 °F | 2.58 in. |
| April | 44.1 °F | 67.3 °F | 3.36 in. |
| May | 55.3 °F | 76.2 °F | 5.9 in. |
| June | 65.4 °F | 86.5 °F | 5.5 in. |
| July | 69.5 °F | 91.1 °F | 4.06 in. |
| August | 67.7 °F | 89.6 °F | 4.34 in. |
| September | 59.3 °F | 82.3 °F | 2.89 in. |
| October | 46.7 °F | 70.6 °F | 3.14 in. |
| November | 34.6 °F | 56.9 °F | 1.6 in. |
| December | 24.9 °F | 45.1 °F | 1.31 in. |
| Annual | 45.8 °F | 67.9 °F | 36.96 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |