Abstract
Data from 38 airborne radiation thermometer (Art) surveys of Georgian Bay (a part of the Laurentian Great Lakes system) over a 4‐year period have been used to determine the areal patterns of surface water temperature and their seasonal variation. Although the limited observational period makes the resulting maps tentative, nevertheless definitive patterns have emerged. Of particular interest are the marked control of surface water temperature by water depth and the influx of cool surface water from Lake Huron during July and August. Ice is found on Georgian Bay from about mid‐December through to late April; the areal extent showed wide year to year variation with the maximum area ranging from 40 to 90% of the whole.

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