Shiwasu

Hello.
This is May in Japan.

It is December from today.
In Japan, we call December "Shiwasu".

師走
　↑
Ｓｈｉｗａｓｕ

Shiwasu refers to December in the solar calendar.
Sometimes we use it.

When Japanese people use it, they feel the end of year, and cold winds.
"Shiwasu" has become a synonym for winter in Japan.