Seawater temperature trends at USA tide gauge sites

Seawater temperatures have been measured at United States tide gauges throu ghout most of the 20(th) century. All available records have been digitized , and the longest 14 have been analyzed by linear least-square regression. The largest positive trend is from Boston MA (+3.6 +/- 0.4 degreesC per cen tury), and the largest negative trend is at Charleston SC (-0.1 +/- 0.3 deg reesC per century). No consistent latitudinal or east-coast vs. west-coast patterns are discernable, but air temperature trends are typically greater than seawater changes.