File:The magnetic and mineral springs of Michigan, to which is prefixed an essay on the climate of Michigan (1872) (14784535633).jpg

Identifier: magneticminerals00kenn (find matches)
Title: The magnetic and mineral springs of Michigan, to which is prefixed an essay on the climate of Michigan
Year: 1872 (1870s)
Authors: Kennedy, Stiles
Subjects: Mineral waters
Publisher: Wilmington, Del., James & Webb
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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een in the fact that the mean temperaturefor January on the Wisconsin shore at Milwaukie is 20^°,while on the same parallel on the Michigan shore at GrandHaven the mean temperature for the same month is 250. Thisis unquestionably the influence of the Lake only. The differ-ence is more striking as we go back from the shores. A fewmiles west of Milwaukie there is a considerable tract of coun-try where the mean temperature for January is 160, while atSt. Louis springs which occupies about the geographical cen-ter of Michigan, the mean temperature is only 22J0, andnone of the isothermal lines that enter Wisconsin at andabove La Crosse, enter Michigan proper, at all; they are deflect-ed, and bent upon themselves by the influence of this Lake,and Lake Superior so that they pass out through the West endof the latter Lake. Another striking singularity is this : that the only iso-thermals for January that reach Michigan from Wisconsin arethose bearing the temperature of 190 and 200. These two
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The Sum of these Influences. 21 lines enter southern Wisconsin at Prairie Du Chien and passobliquely northward and enter the extreme northern point ofMichigan proper at Mackinac, two hundred miles farther norththan Prairie Du Chien. The modification of the climate of Michigan by these in-fluences, is just as striking for any month of the year as forJanuary. By looking at the map, the July isothermal of 72°is seenentering the North West corner ; this line is barely deflectedone degree of latitude in passing through eight and a half de-grees of longitude. Suddenly however coming under the in-fluence of the lakes it falls through three degrees of latitudein nearly the same meredian, bringing it to Chicago ; fromthere it gradually rises to the center of Michigan, where, com-ing under the influence of Lake Huron, it is again deflectedsouthward. Thus the average July temperature of Central Michiganis i° cooler than St. Paul, Minnesota ; a place more than onehundred miles farther North.* T

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