
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)...
Found on
http://nsidc.org/arcticmet/glossary/average_value.html

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 temperatur...
Found on
https://nsidc.org/cryosphere/glossary?page=2
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