. Carnegie Institution of Washington publication. CORRELATION OF DISTRIBUTIONAL FEATURES. 521 encountered in the Transition Zone. The moisture-temperature index possesses almost as narrow an ampUtude as that characteristic of the western section of the Northern Forest region. Alleghanian Zone (fig. 38).âThe temperature conditions of this zone, excepting the length of the frostless season, are very similar to those of the Transition Zone, while the precipitation and other moisture conditions are quite unlike. The frostless season ranges from a length of 106 days to one of 211 days, extremes whi

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. Carnegie Institution of Washington publication. CORRELATION OF DISTRIBUTIONAL FEATURES. 521 encountered in the Transition Zone. The moisture-temperature index possesses almost as narrow an ampUtude as that characteristic of the western section of the Northern Forest region. Alleghanian Zone (fig. 38).âThe temperature conditions of this zone, excepting the length of the frostless season, are very similar to those of the Transition Zone, while the precipitation and other moisture conditions are quite unlike. The frostless season ranges from a length of 106 days to one of 211 days, extremes whi
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Image ID: RFT262
. Carnegie Institution of Washington publication. CORRELATION OF DISTRIBUTIONAL FEATURES. 521 encountered in the Transition Zone. The moisture-temperature index possesses almost as narrow an ampUtude as that characteristic of the western section of the Northern Forest region. Alleghanian Zone (fig. 38).âThe temperature conditions of this zone, excepting the length of the frostless season, are very similar to those of the Transition Zone, while the precipitation and other moisture conditions are quite unlike. The frostless season ranges from a length of 106 days to one of 211 days, extremes which lie well within those of the Transition Zone. The amplitude and extremes in the number of hot days and the number of cold days are very similar, while the normal daily mean of the coldest 14 days of the year is somewhat higher in its extremes, although very similar in its amplitude. In all of the precipitation and other moisture data the Alleghanian Zone exhibits much narrower amplitudes than those of the Transition Zone, because of the high values characteristic of the portions of the latter zone which lie in the extreme Northwest. In nearly all cases extremes for the Alleghanian Zone lie within those of the Transition Zone, the exceptions being the number of days in the longest normal rainy and dry periods in the frostless season. Owing to the winter occurrence of rainfall in the Northwest, these features indicate more moist conditions for the Alleghanian than for the Transition Zone. The amplitude of sunshine duration for the Alleghanian Zone is much less than that for the Transition, ranging from low values upward through about one-third of the entire amplitude for the country. The moisture-temperature index has a much wider amplitude in the former than in the latter zone, slightly exceeding the amplitude for the eastern section of the Northern Mesophytic Evergreen Forest. TCMPCRATURC Davs in Normal Frostless Season (F. S.> C Hot Days. F. S. â Cold Oavs. F. S. I Phv

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