Average value Arithmetic mean (m) of a number (n) of values (x1, x2, ... xn), defined by the equation: m = Sxi/n. Annual average value is calculated from 12 monthly means. Daily average (or mean) value is calculated from 24 hourly readings of a meteorological element, or often from the average of the daily maximum and minimum values (for example, of temperature). Monthly average is usually calculated as the average of the daily average values. |
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