The official National Weather Service forecast for Dubuque — 42.5006°N, 90.6646°W, population 70,332, 61.2 miles from I-80.
| Dubuque County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 27 | 32 | 45 | 59 | 70 | 79 | 83 | 80 | 75 | 61 | 46 | 32 | 57 |
| Avg low °F | 12 | 15 | 27 | 37 | 48 | 59 | 62 | 60 | 53 | 40 | 29 | 18 | 38 |
| Precip in | 1.3 | 1.4 | 2.1 | 3.8 | 4.4 | 5.6 | 4.8 | 4.0 | 3.4 | 3.2 | 2.0 | 1.8 | 37.8 |
1996–2025 normals for Dubuque County — the climate division Dubuque sits in. All-time county record high 100.6°F (1988-08-18); record low -31.4°F (2009-01-16). Source: NOAA / National Weather Service.