Chiang Mai has a tropical climate, but is cooler and less humid than elsewhere in Thailand. Chaing Mai experiences monsoons. The south-west monsoon arrives from India at the end of May and lasts until November, with the heaviest downpours in August/September. Rain usually occurs in the late afternoon. Between November and May cool air blows in from China and northern Vietnam, bringing a dry season with mild days and balmy nights. Temperatures are at their lowest in December/January, and it is chilly enough to require a warm jacket at night.
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