The official National Weather Service forecast for Lansing — 39.2486°N, 94.9002°W, 10.3 miles from I-29.
| Leavenworth County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 44 | 56 | 66 | 76 | 85 | 89 | 87 | 81 | 68 | 55 | 43 | 66 |
| Avg low °F | 20 | 23 | 34 | 44 | 55 | 64 | 69 | 67 | 58 | 46 | 34 | 24 | 45 |
| Precip in | 1.1 | 1.4 | 2.4 | 3.6 | 5.2 | 5.4 | 4.0 | 4.4 | 3.3 | 3.4 | 1.9 | 1.4 | 37.5 |
1996–2025 normals for Leavenworth County — the climate division Lansing sits in. All-time county record high 108.2°F (1954-07-13); record low -21.1°F (1989-12-23). Source: NOAA / National Weather Service.