The official National Weather Service forecast for Lecompton — 39.0444°N, 95.3947°W, 3.2 miles from I-70.
| Douglas County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 57 | 67 | 76 | 85 | 89 | 88 | 81 | 69 | 56 | 44 | 66 |
| Avg low °F | 20 | 24 | 34 | 44 | 54 | 64 | 69 | 67 | 58 | 46 | 34 | 25 | 45 |
| Precip in | 1.1 | 1.4 | 2.4 | 3.6 | 5.4 | 5.3 | 3.9 | 4.4 | 3.4 | 3.3 | 2.0 | 1.4 | 37.6 |
1996–2025 normals for Douglas County — the climate division Lecompton sits in. All-time county record high 109.7°F (1954-07-14); record low -20.9°F (1989-12-23). Source: NOAA / National Weather Service.