. Surface geology and agricultural conditions of Michigan . ATON | rNCHAM JLIVINC^^ 4*-^°^^^^ jKALAMAZOOJ CA^CUN I JACKSON j WAVii-r/^-^ Fig. 1. January mean temperatures, 1886-1911. SEASONAL AND ANNUAL MEANS. Milwaukee. Grand Haven. Green Bay. Ivan. Winter mean 2243684945 2643674946 18 42684744 2141664643 Spring mean Summer mean Fall mean Annual mean The modifying effect of the Great Lakes is quite markedly shownby comparing the seasonal average temperatures of Milwaukeeand Grand Haven, whose latitude is almost identical and both ofwhich are situated immediately on the shore of Lak
. Surface geology and agricultural conditions of Michigan . ATON | rNCHAM JLIVINC^^ 4*-^°^^^^ jKALAMAZOOJ CA^CUN I JACKSON j WAVii-r/^-^ Fig. 1. January mean temperatures, 1886-1911. SEASONAL AND ANNUAL MEANS. Milwaukee. Grand Haven. Green Bay. Ivan. Winter mean 2243684945 2643674946 18 42684744 2141664643 Spring mean Summer mean Fall mean Annual mean The modifying effect of the Great Lakes is quite markedly shownby comparing the seasonal average temperatures of Milwaukeeand Grand Haven, whose latitude is almost identical and both ofwhich are situated immediately on the shore of Lake is still further illustrated by comparison of like data of GreenBay, Wisconsin, and Ivan, Michigan, the former being near theshore of Lake Michigan and the latter being far inland in Kalkaskacounty, Michigan. CLIMATIC CONDITIONS OF MICHIGAN. 15 The interesting point in a comparison of these figures is thatthe winter temperature at the two Michigan points is not assevere as at those in Wisconsin and the summer temperatures arenot as high. ox. 2. July mean temperature, 1886-1911. A feature of Michigan climate in connection with its soil pro-ductivity, is the comparatively long days and short nights due tolatitude. In the Northern Peninsula daylight in June extends from3 a. m. to 9 p. m. In Southern Michigan the longest day of theyear at the summer equinox is nearly fifteen and one-half hourswhereas at New Orleans the longest day of the year is only a littlemore than fourteen hours in length. These long days and shortnights during the crop season are important climatic factors; thedaylight promotes all vegetable growth, and the short nightsoften prevent late frosts in spring and early frosts in the other hand, the frosting of the soil during the late fall andearly spring greatly adds to its tilth and fertility. The topography is not so marked that it exerts a general effectupon climate, but it has some features that exert marked local high land
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