The official National Weather Service forecast for Mountain Green — 41.143°N, 111.7916°W, 0.6 miles from I-84. Forecasts here are written by NWS SLC, this county’s forecast office.
| Morgan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 36 | 45 | 52 | 62 | 73 | 82 | 80 | 71 | 57 | 44 | 34 | 56 |
| Avg low °F | 17 | 18 | 25 | 30 | 38 | 46 | 54 | 52 | 44 | 34 | 25 | 18 | 33 |
| Precip in | 3.1 | 2.6 | 2.6 | 2.6 | 2.3 | 1.2 | 0.7 | 1.3 | 1.6 | 2.2 | 2.2 | 3.1 | 25.5 |
1996–2025 normals for Morgan County — the climate division Mountain Green sits in. All-time county record high 95.5°F (2002-07-14); record low -30.9°F (1982-02-06). Source: NOAA / National Weather Service.