In Southeast Asia people switch between Bali on one side and Chiang Mai, Bangkok or Saigon on the other side
Thailand and Vietnam have summer monsoon whereas Bali has winter monsoon, so you can pretty much stay dry all year.
In Chiang Mai the burning season is at its worst in march, which also makes a lot of people leave for greener pastures down south.
Since SEA is most popular with Digital Nomads it makes sense that patterns would emerge here first. Don't know about other places.