Climate Information
Typical Lake Michigan shoreline conditions near Casa del Lago.
For an accessible monthly reference, the table below uses NOAA National Centers for Environmental Information 1991–2020 climate normals for Port Washington, Wisconsin, a nearby Lake Michigan shoreline station. These are long-term climate normals rather than a forecast or an on-property weather observation.
| Month | Avg. High °F | Avg. Low °F | Mean °F | Precip. in. | Snow in. |
|---|---|---|---|---|---|
| January | 30.8 | 14.6 | 22.7 | 1.76 | 13.20 |
| February | 33.5 | 15.7 | 24.6 | 1.48 | 10.70 |
| March | 41.9 | 25.4 | 33.7 | 1.91 | 6.00 |
| April | 51.0 | 35.4 | 43.2 | 3.78 | 0.80 |
| May | 61.3 | 44.8 | 53.0 | 3.90 | 0.00 |
| June | 71.5 | 54.8 | 63.2 | 4.17 | 0.00 |
| July | 78.7 | 61.5 | 70.1 | 3.61 | 0.00 |
| August | 78.4 | 61.6 | 70.0 | 3.68 | 0.00 |
| September | 71.3 | 53.7 | 62.5 | 3.08 | 0.00 |
| October | 59.2 | 41.6 | 50.4 | 2.56 | 0.00 |
| November | 46.4 | 30.6 | 38.5 | 2.13 | 0.90 |
| December | 35.8 | 20.5 | 28.2 | 1.82 | 10.70 |
| Annual | 55.0 | 38.4 | 46.7 | 33.88 | 42.30 |
Source: NOAA/NCEI U.S. Climate Normals, 1991–2020 — Port Washington, WI station USC00476764 Climate reference reviewed August 2026.