The official National Weather Service forecast for Allen — 43.2808°N, 101.9243°W, 38.4 miles from I-90.
| Bennett County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 35 | 38 | 49 | 58 | 68 | 80 | 88 | 86 | 78 | 62 | 49 | 37 | 61 |
| Avg low °F | 13 | 14 | 24 | 32 | 43 | 53 | 60 | 58 | 49 | 35 | 24 | 15 | 35 |
| Precip in | 0.5 | 0.6 | 1.2 | 2.5 | 3.5 | 3.3 | 2.4 | 2.2 | 1.7 | 1.6 | 0.6 | 0.6 | 20.7 |
1996–2025 normals for Bennett County — the climate division Allen sits in. All-time county record high 110.6°F (2006-07-16); record low -33.7°F (1983-12-23). Source: NOAA / National Weather Service.