52 U. S. COAST AND GEODETIC SURVEY 
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. _Dec. 
Fiq. 25.— Annual variation in sea level, Atlantic City, 1925-29. 
in sea level in New York Harbor at the mouth of the Hudson River is very much the 
same as at Atlantic City, on the open coast, although the two places are nearly 100 miles 
apart. But at Albany, near the upper end of the Hudson and but little farther from 
New York Harbor than is Atlantic City, the annual variation is much different. At 
Albany, freshets cause the highest river level to occur in April; while during the fall 
months, when sea level along the coast is highest, river level at Albany is several feet 
lower than in April. 
Atlantic Coast.—The characteristics of the annual variation in sea level on the 
Atlantic coast of the United States at nine stations from Maine to Florida are shown 
in Figure 26. These curves are derived from the 19 year period of observations, 1930 
