The official National Weather Service forecast for Fitchburg — 42.9608°N, 89.4698°W, 11.2 miles from I-39. Forecasts here are written by NWS MKX, this county’s forecast office.
| Dane County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 28 | 32 | 44 | 58 | 70 | 79 | 83 | 80 | 74 | 61 | 46 | 33 | 57 |
| Avg low °F | 12 | 14 | 25 | 35 | 47 | 57 | 61 | 59 | 52 | 40 | 29 | 18 | 37 |
| Precip in | 1.4 | 1.5 | 2.3 | 3.5 | 4.3 | 5.6 | 4.2 | 4.2 | 3.4 | 2.8 | 2.0 | 1.7 | 36.9 |
1996–2025 normals for Dane County — the climate division Fitchburg sits in. All-time county record high 102.4°F (2012-07-06); record low -37.8°F (1951-01-30). Source: NOAA / National Weather Service.