# Pluviometric coefficient

From AMS Glossary

## pluviometric coefficient

(

*Also called*hyetal coefficient.) For any month at a given station, the ratio of the monthly normal precipitation to one-twelfth of the annual normal precipitation.Seen collectively, the 12 pluviometric coefficients describe the normal month-to-month distribution of the normal annual precipitation in terms of each month's "share" of the annual amount.

*See*isomer.