The official National Weather Service forecast for Atchison — 39.563°N, 95.1216°W, population 10,907, 17.9 miles from I-29.
| Atchison County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 38 | 43 | 55 | 66 | 75 | 85 | 88 | 87 | 80 | 68 | 54 | 42 | 65 |
| Avg low °F | 18 | 22 | 33 | 42 | 53 | 63 | 67 | 65 | 57 | 44 | 33 | 23 | 43 |
| Precip in | 0.9 | 1.2 | 2.1 | 3.5 | 5.0 | 5.1 | 4.2 | 4.1 | 3.2 | 3.2 | 1.8 | 1.3 | 35.6 |
1996–2025 normals for Atchison County — the climate division Atchison sits in. All-time county record high 108.0°F (1980-07-15); record low -22.6°F (1989-12-23). Source: NOAA / National Weather Service.