. Elementary physical geography . Face page 50, Isothermal <. >r the year. DISTRIBUTION OF TEMPERATURE. 51 replaced by a temporary descent (Fig. 25). This happens inour latitude when storms or cold waves pass over us, and pre-vent the effect of the suns heat from becoming in winter we may have thaws, or in midsummer the heatmay be tempered by several days of cool weather; but thereare more irregularities during our winter than during thesummer. The temperature curve shows only the averageof these, its chief value being to illustrate the effect ofthe suns rays as the season
. Elementary physical geography . Face page 50, Isothermal <. >r the year. DISTRIBUTION OF TEMPERATURE. 51 replaced by a temporary descent (Fig. 25). This happens inour latitude when storms or cold waves pass over us, and pre-vent the effect of the suns heat from becoming in winter we may have thaws, or in midsummer the heatmay be tempered by several days of cool weather; but thereare more irregularities during our winter than during thesummer. The temperature curve shows only the averageof these, its chief value being to illustrate the effect ofthe suns rays as the season changes, and to show how differ-ently this effect is manifested in various places. DAILY MEAN TEMPERATURES OF THE STATE FOR 1891, WITH NORMAL VALUES 90 80 70 f 60 m 50 £ 40 ° 90 20 10 „L. | -UCST SEP«-«» OCT0U. . 90SO70606040SO2010 _j_i » ,1 11 j ;> ,7 |7.| 7 .7 1,| * 10 *• 60 75. 90 1H HI US. lit DAY OF THE YEAR Fig. 25. Seasonal curve for New York state. Irregular variations shown by the lighter line. Isothermal Charts. — The best graph
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