Caveat: four seasons?

A nonnet I made.
(Poem #28 on new numbering scheme)

Fifth Season
they say Korea has four seasons.
I think actually there are five:
in mid-summer, the sky hides;
and the pouring rain comes;
so I dodge rivers;
and more rain comes;
and humid,
sultry
air.

– a nonnet
[daily log: walking, 2km]