The official National Weather Service forecast for Spencer — 43.1414°N, 95.1444°W, population 10,967, 67.9 miles from I-90.
| Clay County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 30 | 44 | 58 | 70 | 81 | 84 | 81 | 76 | 61 | 45 | 31 | 57 |
| Avg low °F | 8 | 11 | 24 | 35 | 47 | 59 | 62 | 59 | 51 | 38 | 25 | 14 | 36 |
| Precip in | 0.7 | 0.8 | 1.7 | 3.1 | 4.3 | 4.8 | 3.5 | 3.7 | 3.0 | 2.4 | 1.4 | 1.1 | 30.5 |
1996–2025 normals for Clay County — the climate division Spencer sits in. All-time county record high 101.9°F (1995-07-13); record low -30.7°F (1970-01-21). Source: NOAA / National Weather Service.