Around the middle of a period; roughly the midpoint of a month, season, etc.
7月中頃に友人と旅行に行く予定です。
I plan to travel with a friend around mid-July.
会議は午前中頃に一度休憩を入れます。
We'll take a short break around the middle of the morning session.
冬の中頃は日が短く、とても寒くなる。
In the middle of winter the days are short and it becomes very cold.