The official National Weather Service forecast for Broomfield — 39.9205°N, 105.0867°W, 6.5 miles from I-25. Forecasts here are written by NWS BOU, this county’s forecast office.
| Broomfield County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 47 | 56 | 62 | 71 | 84 | 90 | 87 | 80 | 66 | 55 | 47 | 66 |
| Avg low °F | 19 | 20 | 27 | 34 | 43 | 53 | 59 | 56 | 48 | 36 | 27 | 20 | 37 |
| Precip in | 0.5 | 0.7 | 1.2 | 2.0 | 2.6 | 1.6 | 1.7 | 1.5 | 1.3 | 1.0 | 0.6 | 0.5 | 15.2 |
1996–2025 normals for Broomfield County — the climate division Broomfield sits in. All-time county record high 103.5°F (1973-07-07); record low -27.7°F (1963-01-12). Source: NOAA / National Weather Service.