The official National Weather Service forecast for McPherson — 38.3708°N, 97.6642°W, population 14,039, 4.2 miles from I-135.
| McPherson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 46 | 58 | 68 | 77 | 88 | 93 | 91 | 83 | 70 | 57 | 45 | 68 |
| Avg low °F | 20 | 23 | 34 | 42 | 53 | 64 | 68 | 67 | 58 | 46 | 33 | 23 | 44 |
| Precip in | 0.9 | 1.1 | 2.1 | 2.6 | 4.8 | 4.4 | 3.6 | 3.8 | 2.9 | 2.5 | 1.5 | 1.2 | 31.4 |
1996–2025 normals for McPherson County — the climate division McPherson sits in. All-time county record high 112.2°F (1954-07-14); record low -20.4°F (1989-12-23). Source: NOAA / National Weather Service.