THE DAILY QUANTITIES IN WHICH SUMMER PRECIPITATION IS RECEIVED

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  • 1 U. S. Bureau of Plant Industry, Washington, D. C
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Abstract

SYNOPSIS

The daily precipitation during the five months from April to August, inclusive, for the 12-year period from 1908 to 1919, inclusive, was studied at eight stations in the Great Plains and at Washington, D. C., Nephi, Utah, and Moro, Oreg. During 153 days of these months Washington had measurable precipitation on 55.8 days, the Great Plains on 41.7 days, Nephi on 26.3 days, and Moro on 21.8 days. Within limits, the quantity of precipitation is not determined by the number of days on which it occurs. In the Great Plains 82 per cent of the days having measurable precipitation have 0.50 inch or less and 45 per cent have 0.10 inch or less. In quantities from 0.05 inch up to a critical point, which is approximately 0.30 inch at Moro and Nephi, from 0.70 inch to 1.10 inches in the Great Plains, and 1.20 inches at Washington, the frequency of a given precipitation is inversely proportional to its amount. Above the critical point the decrease in frequency is more rapid than increase in amount. The number of precipitations below 0.05 inch increases with decreasing quantity but not in the same proportion.

Abstract

SYNOPSIS

The daily precipitation during the five months from April to August, inclusive, for the 12-year period from 1908 to 1919, inclusive, was studied at eight stations in the Great Plains and at Washington, D. C., Nephi, Utah, and Moro, Oreg. During 153 days of these months Washington had measurable precipitation on 55.8 days, the Great Plains on 41.7 days, Nephi on 26.3 days, and Moro on 21.8 days. Within limits, the quantity of precipitation is not determined by the number of days on which it occurs. In the Great Plains 82 per cent of the days having measurable precipitation have 0.50 inch or less and 45 per cent have 0.10 inch or less. In quantities from 0.05 inch up to a critical point, which is approximately 0.30 inch at Moro and Nephi, from 0.70 inch to 1.10 inches in the Great Plains, and 1.20 inches at Washington, the frequency of a given precipitation is inversely proportional to its amount. Above the critical point the decrease in frequency is more rapid than increase in amount. The number of precipitations below 0.05 inch increases with decreasing quantity but not in the same proportion.

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