The Adjustment of Mean Hourly Values for Diurnal Range

Abstract

The mean hourly values of the different meteorological elements given in this volume are the simple arithmetical means (or sums) of the observations; but in the tables, which show the departure of each hourly value from the mean for the whole day, a correction has been applied to eliminate any general rise or fall which may take place throughout the whole day, and thus to more nearly show the true diurnal effect independent of changes of longer period than twenty-four hours.