Lake MononaWater Level & Temperature
Lake Monona water level & water temperature
Lake Monona water level is updated continuously from the operating agency. Typical level elevation is 845.2 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
Lake Monona water temperature by month
Lake Monona surface water temperature averages from about 35°F in January to 78°F in July over the year, based on a 40-year USGS model (1980–2020). Cold-water caution applies in roughly half the year, when the typical temperature is below 60°F.
Jan
35°
Feb
35°
Mar
38°
Apr
46°
May
60°
Jun
72°
Jul
78°
Aug
77°
Sep
70°
Oct
57°
Nov
45°
Dec
37°
Typical surface temperatures (°F), modeled historical averages (USGS 185k-lake dataset, 1980–2020). Colors flag cold-water risk: blue/amber/red = cool, caution, danger. Live and recent readings appear above where a sensor is available.