Climate of United States. 147 
the Atlantic coast, also along a part of the Gulf coast. It is also found in the 
western region before mentioned, only somewhat farther south, occupying 
northern Texas, New Mexico and Arizona. : 
The regions of maximum rainfall in autumn are not of much interest, 
except in the extreme southeast, where there is a marked maximum about 
the peninsula of Florida in September. In September, also, there is a second- 
ary maximum in the region of the upper Great lakes, a part of the upper 
Mississippi Valley, and along the Texan Gulf coast from Galveston westward. 
In October, the maximum on the upper lakes has extended to the lower, and 
in November this maximum has extended to the coast of New England, and 
to an area through the central states, reaching from Ohio to Texas. — The 
regions of maximum rainfall in winter are most interesting on the Pacific 
coast. Here the maximum rainfall occurs in December, and this area of 
maximum occupies not only the entire coast, but a region in the interior 
which generally extends to the continental divide. Toward the south there 
is a secondary maximum in the eastern part of this area, and in New Mexico. 
In January there is a region of maximum precipitation extending from southern 
Iowa to Lake Huron, and another much more extensive region extending 
along the Atlantic and Gulf coast to the peninsula of Florida. These two 
waves of higher rainfall for January meet in February along a line which lies 
approximately half way between then. ; 
Minimum monthly rainfall. Beginning with the spring minimum, We 
find that in March there is only one — on the lower part of the peninsula 
of Florida. By April, the area of minimum rainfall occupies the coast from 
Norfolk southward, and also the interior from Eastport, Maine, to Little Rock, 
Arkansas. By May, it has drifted on until it occupies the coast from Massa- 
chusetts to Norfolk, Virginia, and along the Gulf coast to New Orleans, 
Louisiana, and northward to Arkansas and Tennessee. The summer minima 
are found in June along the New England coast to Long Island. In July Bey 
are found in a larger area, extending over the lower peninsula of De 
to central Texas. In August there is a series of minima along the lakes ger 
Rochester to Cleveland, and an extensive area of minimum rainfall over E 
western states, along the Pacific coast, in the interior of Idaho and ge ee 
central Illinois. In September the minimum area extends from er ia 
New York, to Cairo, Illinois and from Portland, Maine, to Long !$ = a: 
October, the New England series of minima has passed southward an r 
now found in southern New York, eastern Pennsylvania, New Jersey = 
Maryland. It is also found over the southwestern states from Missour! a m 
ward, and from Georgia westward to Illinois, in the Iower zer zö R = 
In November the minima extend along the Atlantic coast from .. 
Florida and cover a large area in the northwest from the —_—. 
eastward to the Missouri River and southward to the northern oundary r 
New Mexico and Arizona. The winter series of minima is somewhat mo 
complicated and will be omitted from discussion here. - 
o 
