The first ten days of a month; commonly used in schedules and weather forecasts to indicate early-month timing.
会議は今月初旬に予定しています。
The meeting is scheduled for early this month (in the first ten days).
旅行は来月初旬が一番安い時期だ。
Early next month is the cheapest time to travel.
初旬は気温が低く、雪が降ることがある。
Temperatures are low in the early part of the month, and it can snow.