Daily mean

From Glossary of Meteorology
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daily mean

The long-period mean value of a climatic element on a given day of the year.

A curve of daily means throughout the year shows the annual variation in much greater detail than a curve based on monthly means, but unless it is based on a long period (at least 50 years) it will probably be dominated by random irregularities. Such long-period daily means might be referred to as “normal daily values.”