Climate and weather in Thailand
The climate of Thailand is humid tropical and subtropical. This is due to the location of most of the country in the tropical and subtropical zones and the influence of the southwestern and northeastern monsoons. The distance between the extreme northern and extreme southern points of Thailand is 1860 km, and the difference in latitude is about 15. Such a length from north to south makes Thailand climate one of the most diverse in Southeast Asia. The southwest monsoon brings rain and relative coolness at the end of May - mid July. By November, the rains cease, and the “cool dry” season begins, continuing until mid-February. The influence of the northeastern monsoon, which does not touch Northern, Northeastern, and Central Thailand directly, but brings coolness, also affects this time. After the weakening of the monsoons, in February - May, there is a strong heat, and the humidity of the air gradually increases until the beginning of the new monsoon season, and then the cycle repeats again.
The duration of the rainy season is very difficult to determine. It usually starts in May - June and may continue until November. In the center of the country and on the east coast heavy rains occur in August - September. October is usually the last month of the rainy season, when significant amounts of water have already accumulated in the irrigation systems and urban drainage, with the result that quite frequent floods occur with infrequent and not very heavy rains. In particular, when the Chaopraya River overflows its banks, some quarters of Bangkok are flooded, because about a third of the city is below sea level. The rainy season in Thailand is incomparable with the same time of year in other countries of Southeast Asia. Of course, dirt roads are made impassable, and clouds hang over part of the day tropical beaches; however, they transmit enough UV rays to warm the air, sea and sand of beaches.
So in the coolest months (from December to February, when the average temperature ranges from + 20 ° C to + 27 ° C) nighttime air temperature can drop to zero in the mountains in the north, while in the daytime it reaches + 25 ° C. In the mornings in Chiang Mai (the capital of Northern Thailand) at this time is about + 10 ° C, and in other areas above + 20 ° C. The hottest months are April and May, when the temperature is above + 35 ° C is the daily norm, and + 40 ° C is not uncommon.