Eleven-year Sun-spot Weather Period and its Multiples

Abstract

MANY years ago, investigations in regard to the existence of a period of about eleven years in the weather corresponding with the eleven-year sun-spot period were actively carried out in various parts of the world. Much data was accumulated in support of such a period, a large part of which was published in the earlier volumes of NATURE. But the investigations, as a whole, showed that the period was less marked or more complex than at first anticipated, so that recently less interest has been manifested in the subject, and indeed many express their doubts as to the existence of such a period.