The official National Weather Service forecast for Langdon — 48.76°N, 98.3682°W, 51.9 miles from I-29.
| Cavalier County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 14 | 18 | 31 | 49 | 64 | 74 | 79 | 77 | 69 | 52 | 34 | 19 | 48 |
| Avg low °F | -3 | -1 | 12 | 27 | 40 | 51 | 56 | 53 | 45 | 32 | 17 | 3 | 28 |
| Precip in | 0.6 | 0.5 | 0.7 | 1.2 | 2.8 | 3.6 | 3.1 | 2.5 | 2.2 | 1.6 | 0.8 | 0.8 | 20.4 |
1996–2025 normals for Cavalier County — the climate division Langdon sits in. All-time county record high 102.9°F (2021-06-05); record low -41.3°F (1966-01-28). Source: NOAA / National Weather Service.