Having holiday & vacation in Khao Yai National Park (Thai เขาใหญ่) Thailand, you should know that it lies largely in Nakhon Ratchasima Province (Khorat), but also includes parts of Saraburi, Prachinburi and Nakhon Nayok provinces. It was the country's first national park, established on September 18, 1962. A major role in its establishment was done by Boonsong Lekakul, one of the 20th century's most famous conservationists in Thailand.
The park is the second largest in Thailand. It covers an area of 2,168 square kilometers, including evergreen forests and grasslands. Its altitude mostly ranges from 400 to 1000 m above sea level. There are 3,000 species of plants, 320 species of birds and 67 species of mammals, including Asiatic black bears, Asian elephants, gaur, tigers, gibbons, Indian sambar deer, Indian muntjac, dholes, and wild pigs. Its waterfalls include the 80 metre Heo Narok, and Haeo Suwat made famous from the film The Beach. Namtok Sarika is popular with the Thais.
Khao Yai has three main seasons, with an annual mean temperature of 23'C, though this varies greatly with the seasons.
Rainy Season: May-October. During this season, it rains most days, resulting in stunning waterfalls. The atmosphere is humid, with average daytime temperatures of 27'C, In the humidity, flora and fauna flourish, whilst after the rain there is clean air and clear visibility (great for photograph!).
Cold Season: November-February. This is the most popular time to visit Khao Yai, as clear, sunny and cool weather are ideal for hiking and nice sunsets are common. The days average around 22'C, while the nights can drop to 10'C.
Hot Season: March-April Even in the hot season, <b>Khao Yai</b> does not experience of heat felt elsewhere in the country. Daytime temperatures reach between a high 20'C, to a low 30'C, During this season it is dry and often windy. Waterfalls can be dry by April.