Lunar Synodical Period and Widespread Precipitation

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Science  07 Sep 1962:
Vol. 137, Issue 3532, pp. 748-749
DOI: 10.1126/science.137.3532.748


Precipitation activity over broad areas appears to be closely associated with the monthly lunisolar cycle. Indexes of precipitation in the continental United States over a continuous 50-year period, and 91-year daily histories of individual stations, reveal that heavy rains occur most frequently in the first and third weeks of the synodical month.

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