Surface geology and agricultural conditions of Michigan . he stations in the Southern Peninsula. But inthe interior of the Northern Peninsula there is danger of local frostsany month of 1 lie summer. The records do not make clear whetherthe summer frosts are, in ;i given case, severe enough to seriouslyinjure Crops. In some cases il is known that little or no damage isdone by the late spring or early Tall frosts. Tims it is stated in theAnimal Report for 1906 of the Northern Peninsula Experiment Sta-tion at Chatham thai no damage COUld !»<• observed from frosts that 22 SURFACE GEOLOGY OF MI
Surface geology and agricultural conditions of Michigan . he stations in the Southern Peninsula. But inthe interior of the Northern Peninsula there is danger of local frostsany month of 1 lie summer. The records do not make clear whetherthe summer frosts are, in ;i given case, severe enough to seriouslyinjure Crops. In some cases il is known that little or no damage isdone by the late spring or early Tall frosts. Tims it is stated in theAnimal Report for 1906 of the Northern Peninsula Experiment Sta-tion at Chatham thai no damage COUld !»<• observed from frosts that 22 SURFACE GEOLOGY OF MICHIGAN. occurred May 28 and 29 and June 12, not even on corn and buck-wheat which on June 12 were several inches high. The same wastrue of frosts on September 1 and 28, the first severe frost beingthat of October 11. The real season between killing frosts for thatstation in 1906 extended from May 20 to October 11, or 144 daysinstead of the 81 days between June 12 and September 1 which theWeather Bureau Kecords would suggest. In some cases it is known. Fig. 7. Average length crop growing season, days. that these summer frosts are sufficiently severe to injure tendervines such as cucumbers and melons, without affecting the grainsand vegetables which form the main crops of the region. In generalit may be stated that there are in the most favorable seasons sixmonths of the growing season throughout? the peninsula, from Mayto October inclusive. But in some years the growing season is onlyfour months, from June to September. The tables serve to illustrate the statemenl made above: thatfrost is especially liable to occur on the Landward side of ranges CLIMATIC CONDITIONS OP MICHIGAN. 23 that front on Lake Superior at times when the lakeward slope isuntouched. It will be noted also that points situated on LakeSuperior have an exceptionally long season between spring and fallfrosts. This is true even on Isle Roy ale in latitude 48°. Reference may be made to the reports of the Weathe
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