…would be September, then, I guess.

秋霜烈日
shuu.sou.retsu.jitsu

Literally: autumn – frost – intense – sun

Alternately: Stringent severity – of intent, or of some expression of authority such as discipline, punishment, etc. Strictness as harsh as a lethal late-fall frost or the burning summer sun.

Notes: Naturally, replacing 烈 with homophone 列, “line up,” is an error.

Apparently also the common name of this badge design for public prosecutors. Make of that what you will.