The official National Weather Service forecast for Derby — 37.5456°N, 97.2689°W, 5.1 miles from I-135.
| Sedgwick County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 44 | 48 | 60 | 69 | 78 | 88 | 93 | 91 | 84 | 71 | 58 | 47 | 69 |
| Avg low °F | 22 | 25 | 35 | 44 | 55 | 65 | 69 | 68 | 60 | 47 | 35 | 25 | 46 |
| Precip in | 0.9 | 1.2 | 2.4 | 2.9 | 5.2 | 5.1 | 3.7 | 3.8 | 2.8 | 3.2 | 1.7 | 1.2 | 34.1 |
1996–2025 normals for Sedgwick County — the climate division Derby sits in. All-time county record high 113.3°F (1954-07-14); record low -16.1°F (2021-02-16). Source: NOAA / National Weather Service.