Each drop counts as two in December

December rains are always bigger than they appear.

That's because water-robbing evaporation is at its annual ebb.

Last week's big rain doesn't look so big,
until you consider it fell during the cool
and non-transpiring part of the year

That gives winter rains a longer residency in the swamp,

i.e. the sun and transpiring plants can't pull it away.