Month 01 of 12
January
The one stretch of the year when every coast and the whole interior are dry at the same time, which makes the decision about everything except the weather.
In January, train in Chiang Mai, Pai, Isaan (Northeast) and Hua Hin. Think twice about Phuket.
January is the only month alongside February where the Andaman coast, the southern Gulf, the upper Gulf, the central plains and the north are all inside their dry windows at once. Nothing in the climate is choosing for you, so the thing to compare is how full a camp is and what it is charging while it is full.
That is not a neutral fact in Phuket. The island is in its busiest weeks, and the camps there are the hardest in the country to walk into without having booked. The north is the inversion worth knowing about: Chiang Mai and Pai are dry and the air has not gone yet, which is a window that closes within weeks.
10 regions
Inside the dry window
The month either side