File:Surface geology and agricultural conditions of Michigan (1917) (14802739073).jpg

Identifier: surfacegeologyag00leve_0 (find matches)
Title: Surface geology and agricultural conditions of Michigan
Year: 1917 (1910s)
Authors: Leverett, Frank, 1859-1943 Schneider, C. F. (Charles Frederick), 1866-
Subjects: Geology Agriculture Physical geography
Publisher: Lansing, Mich., Wynkoop, Hallenbeck, Crawford Co., State printers
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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cially favorablefor escaping early frosts in the autumn, because of the rise of theair from the lake to these highlands. Very often the highlands onthe slope toward the lake escape frosts for nearly a month later thanlow lying districts in the interior of the Peninsula, or even thanthe land immediately back of these ranges. The ranges facing uponthe lake will therefore be especially favorable places for the cultiva-tion of orchards and raising of fruits of all classes, as well as for thegrowing of cereals. CLIMATIC CONDITIONS OP MICHIGAN. 19 Long heated spells in summer or abnormally protracted coldperiods in winter are very unusual. Historical periods of abnormaltemperatures occurred in the summer of 1911 and the winter of 1899.The continued high temperatures prevailing during the latter partof June and the early half of July in 1911 were phenomenal and, had never before been equalled so far as duration is concerned. Onthe other hand, the phenomenal cold weather which occurred during
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Fig. 4. Lowest known temperatures, 1886-1911. the second and third decades of February, 1899, marked the longestperiod of low temperatures known. A strong factor in producingthe continued cold of February, 1.S99, w as (lie freezing OVerj or ratherthe covering with fields of rubble ice, of Lake Michigan, thus forminga bridge Tor, instead of ;i barrier to, the advance of the northwesterncold wave that crossed the northern states that month. 20 SURFACE GEOLOGY OP MICHIGAN. FROSTS. The Weather Bureau is in possession of a twenty-five-year recordfrom a large number of places in the Southern Peninsula from whichit has been able to determine the average date of the last killingfrost in spring and the first in autumn and, using these dates asboundaries, we can mark the average beginning and ending of crop

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