Fig. 45.—Weather. Sixth Day.
The Weather of Temperate and Torrid Zones.—The facts of the presence of clear weather in one region while snow is falling in
another, and of the variability of our weather from day to day in different parts of the United States, are emphasized by these charts
of weather conditions. This changeableness of weather is a marked characteristic of the greater portion of the Temperate Zones, especially in winter. The weather maps for successive days do not, as a rule, show a repetition of the same conditions over extended regions. In the Torrid Zone it is different. Over the greater part of that zone the regularity of the weather conditions is such that, day after day, for weeks and months, the same features are repeated. There monotony, here variety, is the dominant characteristic of the weather.
Part IV.—The Correlations of the Weather
Elements and Weather Forecasting.
CHAPTER IX.
CORRELATION OF THE DIRECTION OF THE WIND AND THE
PRESSURE.