The climate of Thailand may be devided into three seasons as follows:

Hot season begins in mid of Febuary to mid of May. This is the transitional period from the northeast to southwest monsoons. The temperature at daytime always reaches 35-40C and drops to 27-32 at evening. The peak month is in the mid of April. Conditions are worsened by the debilitating humidity at over 80% day and night.

Rainy season begins in mid of May to October. The southwest monsoon prevails over Thailand and abundant rain occurs over the country. Rainfall hardly found in continuous, but just periodical and paused unless an arrival of tropical depression or cyclone. The wettest period of the year is August to September.

Cool and dry season begins in November to Febuary. This is the northeast monsoon season that is the mild period of the year with quite cold in December to January. Normally, the temperature usually drop down to 17-21C when the high pressure from Mongolia and China moved toward and coverded in Bangkok. The humidity also decrease into 50%.