The official National Weather Service forecast for New Holstein — 43.95°N, 88.0843°W, 16.1 miles from I-43. Forecasts here are written by NWS GRB, this county’s forecast office.
| Calumet County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 30 | 41 | 54 | 67 | 77 | 81 | 79 | 72 | 59 | 44 | 31 | 55 |
| Avg low °F | 11 | 13 | 23 | 34 | 45 | 55 | 60 | 58 | 51 | 40 | 29 | 18 | 36 |
| Precip in | 1.4 | 1.2 | 2.2 | 3.0 | 4.0 | 4.7 | 3.8 | 3.8 | 2.9 | 2.9 | 1.9 | 1.7 | 33.5 |
1996–2025 normals for Calumet County — the climate division New Holstein sits in. All-time county record high 99.6°F (1995-07-14); record low -30.7°F (1982-01-17). Source: NOAA / National Weather Service.