Ice cover
Lake Ontario (Lake America) Ice Cover
Lake Ontario (Lake America) rarely freezes over fully in winter, and its depth is the reason: the lake reaches a maximum of 802 feet in the Rochester Basin west of Oswego. This page is most relevant from November through March. During winter, when ice does form, NOAA's Great Lakes Environmental Research Laboratory (GLERL) tracks coverage percentages, and this page will link to live ice data once the season arrives.
Seasonal, see below
This page only carries meaning during the winter season. Outside of winter there is no ice to report.
Lake Ontario rarely freezes over fully because of its depth, 802 feet at its deepest, in the Rochester Basin west of Oswego.
The current season's ice cover percentage is not published here yet. NOAA GLERL maintains a Great Lakes ice cover data set that has not yet been wired into the lake-data worker. Once it is, this page will show the current percentage.
Source: Britannica and NOAA bathymetry chart for depth; research/seo.md for freeze behavior. Ice cover percentages will come from NOAA GLERL and are not yet published.