The official National Weather Service forecast for Alamo — 48.5817°N, 103.4699°W, 113 miles from I-94.
| Williams County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 21 | 25 | 38 | 54 | 66 | 76 | 83 | 83 | 73 | 55 | 38 | 25 | 53 |
| Avg low °F | 2 | 4 | 16 | 28 | 40 | 50 | 56 | 53 | 44 | 31 | 18 | 6 | 29 |
| Precip in | 0.4 | 0.4 | 0.5 | 1.0 | 2.5 | 2.8 | 2.4 | 1.4 | 1.4 | 1.0 | 0.6 | 0.6 | 15.0 |
1996–2025 normals for Williams County — the climate division Alamo sits in. All-time county record high 106.8°F (2007-07-25); record low -41.9°F (1962-02-28). Source: NOAA / National Weather Service.