The best months to go to Chiang Mai are from November to April knowing that in March, April and May, it is very hot (average around 34 ° C in the warmest of the day but it happens regularly that it is 40 ° C and over). It is not directly related to the climate although the lack of rain amplifies the phenomenon but in March, the quality of the air is regularly very bad in Chiang Mai because of the fields burning in the neighborhoods. It sometimes already starts at the end of February and pollution reaches such levels that wearing an N95 anti-particle mask is often recommended.
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