Abstract
Abstract SYNOPSIS Sunshine is a very important climatic element, not only from the standpoint of the a agriculturist, but also from its physical effect on man and other animals. The depressing influence on human beings of long periods of cloudy and damp weather is noticeable, even to the casual observer, while, on the other hand, long periods of successive days with continuous sunshine and high temperature are trying on all animal and plant life. Long hot periods are usually characterized by few clouds and much sunshine, when, day after day, the amount of insolation received during the daytime results in an accumulation of heat in excess of that lost at night by radiation. Finally a change in pressure conditions results in the breaking up of the stagnant atmosphere, bringing refreshing winds and welcome clouds to relieve the situation. Sunshine data are recorded and expressed either in values giving the actual amount in hours and tenths, or by indicating the percentage of the possible amount. Each of thes...
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