The official National Weather Service forecast for Ralston — 41.2053°N, 96.0425°W, 2.6 miles from I-80.
| Douglas County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 37 | 51 | 63 | 73 | 84 | 87 | 84 | 79 | 66 | 51 | 37 | 62 |
| Avg low °F | 15 | 18 | 29 | 40 | 51 | 62 | 66 | 64 | 55 | 42 | 30 | 19 | 41 |
| Precip in | 0.8 | 1.0 | 1.9 | 3.1 | 5.0 | 4.6 | 3.5 | 4.1 | 2.9 | 2.5 | 1.3 | 1.2 | 31.9 |
1996–2025 normals for Douglas County — the climate division Ralston sits in. All-time county record high 105.7°F (1995-07-13); record low -25.4°F (1974-01-12). Source: NOAA / National Weather Service.