The official National Weather Service forecast for Aberdeen — 45.4647°N, 98.4865°W, population 27,982, 70 miles from I-29.
| Brown County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 22 | 26 | 40 | 55 | 68 | 79 | 84 | 82 | 74 | 58 | 41 | 27 | 55 |
| Avg low °F | 3 | 6 | 19 | 31 | 44 | 55 | 60 | 57 | 48 | 35 | 21 | 9 | 32 |
| Precip in | 0.5 | 0.5 | 0.9 | 2.0 | 3.1 | 3.5 | 3.1 | 2.7 | 2.2 | 1.9 | 0.7 | 0.7 | 21.8 |
1996–2025 normals for Brown County — the climate division Aberdeen sits in. All-time county record high 107.4°F (2006-07-16); record low -39.2°F (1994-02-09). Source: NOAA / National Weather Service.