. Elementary physical geography . DISTRIBUTION OF TEMPERATURE. 59 The influence of topography is also well shown in several por-tions of the charts for the United States, and also on the New. York chart (Plate 8), where the isotherms are seen to extendup the valleys, showing that they are warmer than the hills. 60 PHYSICAL GEOGRAPHY. Daily Temperature Curve. — The daily curve representsfor the day what the seasonal curve does for the year. Itshows the rise in temperature during the daytime and itsfall at night (Fig. 27). Unless interfered with by someaccidental cause, the temperature rises fro
. Elementary physical geography . DISTRIBUTION OF TEMPERATURE. 59 The influence of topography is also well shown in several por-tions of the charts for the United States, and also on the New. York chart (Plate 8), where the isotherms are seen to extendup the valleys, showing that they are warmer than the hills. 60 PHYSICAL GEOGRAPHY. Daily Temperature Curve. — The daily curve representsfor the day what the seasonal curve does for the year. Itshows the rise in temperature during the daytime and itsfall at night (Fig. 27). Unless interfered with by someaccidental cause, the temperature rises from sunrise tillearly afternoon, and then descends until late in the in the case of the seasonal curve,| . | the time of highest temperature is not I i I : 5 I when the suns rays are strongest, noris the coldest part of night at explanation is the same, the heat ofthe sun in the morning being partly ex-pended in warming the earth which wascooled in the preceding night; and thetemperature at night time continues todescend after midnight, because the radia-tion of the heat that came during the dayproceeds uninterruptedly, and its influenceis not checked until the s
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