An attempt is made in this paper to identify the areal patterns of significant thermal influence exerted by the Great Lakes by use of the methods of anomalies and isanomal mapping. Empirical temperature models for the seasonal months of January, April, July and October were constructed and the mean monthly temperatures of some 500 stations within the Great Lakes Region were compared to these models. The same procedure was used for average annual temperature ranges. The resultant deviations were mapped and their patterns described and analyzed. Based on these patterns of mean deviations, the areal extent and seasonal variation of the Great Lakes' effect on vicinal temperature regimes is graphically shown, and the method of isanomal mapping is further substantiated as an effective climatological technique.

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