ABSTRACT 
This report classifies harbor areas having similar water 
temperature characteristics. The principal predictor is the 
mean monthly air temperature at locations throughout the 
world. A system of classification based primarily on the con- 
tinentality of the area is presented. Factors which cause 
anomalies from the general case are large tidal ranges and 
fresh water discharge from rivers. Within each class, the mean 
air-water temperature difference at the surface (near the 
shore) is presented with standard deviations from the mean 
difference for each month. In addition, data showing vertical 
thermal gradients from the shore seaward are presented for 
the various classes by season. 
