From Glossary of Meteorology


An arithmetic average.

Types can include mean over an ensemble of experimental realizations, mean over a time period, mean along a line such as a road or flight path, mean in an area such as a farm field, or mean within a volume of air such as can be sampled by a remote sensor. For example, the mean wind speed from anemometer measurements is the speed at a fixed point averaged over a time period such as 10 minutes.