The official National Weather Service forecast for Morrison — 39.6536°N, 105.1911°W, 3.1 miles from I-70. Forecasts here are written by NWS BOU, this county’s forecast office.
| Jefferson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 43 | 50 | 56 | 65 | 77 | 83 | 80 | 74 | 62 | 51 | 43 | 60 |
| Avg low °F | 17 | 18 | 24 | 29 | 38 | 47 | 53 | 52 | 44 | 33 | 25 | 18 | 33 |
| Precip in | 0.7 | 0.9 | 1.7 | 2.3 | 2.5 | 1.7 | 2.2 | 2.1 | 1.5 | 1.2 | 0.8 | 0.7 | 18.3 |
1996–2025 normals for Jefferson County — the climate division Morrison sits in. All-time county record high 95.1°F (2012-06-26); record low -30.7°F (1951-02-01). Source: NOAA / National Weather Service.