A Dictionary of Weather

diurnal variation

A Dictionary of Weather | 2001 | Copyright

diurnal variation A fluctuation in an atmospheric element over the course of a day, obtained by averaging observations over a sufficient length of time to remove all non-periodic variations. Temperature and relative humidity show distinct diurnal variations. The former reaches a maximum about 2 hours after local noon in winter, 3 hours after noon in summer, and a minimum around sunrise. The variation in humidity is approximately opposite in phase.…

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