Is the tourism industry a cyclical industry? When is talk season? When is the peak season?

Tourism is a seasonal industry. What exactly does the so-called off-season and peak season depend on? For example, when traveling to Hainan, the off-season (rainy season) is generally from May to October, and the peak season is from October to April; for example, the peak season is from June to September in Xinjiang, and the rest is the off-season because of the cold weather. Also, there is summer vacation in July and August, which is the peak tourist season. Generally speaking, summer, Spring Festival, National Day and spring are the peak tourist seasons in my country, while June and November are the off-season.