The official National Weather Service forecast for McGregor — 43.0183°N, 91.1826°W, 63.6 miles from I-380.
| Clayton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 31 | 44 | 58 | 70 | 79 | 82 | 80 | 74 | 61 | 46 | 32 | 57 |
| Avg low °F | 10 | 13 | 25 | 36 | 47 | 58 | 62 | 59 | 52 | 40 | 28 | 16 | 37 |
| Precip in | 1.2 | 1.2 | 2.2 | 3.7 | 4.7 | 5.7 | 4.7 | 4.1 | 3.6 | 3.0 | 1.9 | 1.7 | 37.7 |
1996–2025 normals for Clayton County — the climate division McGregor sits in. All-time county record high 102.3°F (1988-08-01); record low -33.3°F (1996-02-04). Source: NOAA / National Weather Service.