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Basically, the temperature ranges between
20 degree Celsius and 31
degree Celsius in Chiang Mai. However, weather is typically cold all year round,
with an average temperature of 25 degree Celsius. The relative humidity averages at 72% and
the annual rainfall is normally 1,000-1,200 mm. The climate is characterized
by monsoon which creates three distinct seasons.
The south-west monsoon usually arrives from India at the end of May and lasts
until November. Rainfall is generally heaviest in September with an average
precipitation of 250 mm for that month alone. Clouds in the afternoon and subsequent
rain, dry evenings, occasional rain at night. The north-east monsoon lasts from
middle of November until early May and brings cool air from northern Vietnam
or China but no rain for Northern and Central Thailand.
From March to May, the heat is on the agenda and maximum daytime temperatures
reach 40°C to 100°F. At night it mostly cools down and mornings can be quite
pleasant but balmy in the evenings. Air has less humidity than in other parts
of the country throughout the year. The low humidity is the main reason why
air seems more pleasant here. Moreover, the temperature difference between day
and night and between the seasons is greater than that in the other regions.
If you plan to visit during the cold season, especially around Christmas and
New Year when it gets coldest, be sure to bring warm clothes which means a pullover
and a jacket.




