dry spell
From Glossary of Meteorology
A period of precipitation below a specified amount.
The specific period and amount of precipitation vary depending on the particular activity under discussion.
The specific period and amount of precipitation vary depending on the particular activity under discussion.
Any function of time f(t) is periodic with period t if f(t) = f(t + τ) for all times t, where τ is the smallest number for which this equality holds.
