As a result of the altitude and latitude in which CHiang Mai is situated, there is a wide seasonal variation in the weather.

Cool Season: November - February

The temperatures can drop dramatically at night so warm clothing is required during these months, particularly if you are travelling in the mountains.

Hot Season: February-May

As the dry season progresses, the heat increases with the haze. Storms in May can bring some welcome rain.

Wet Season: May-October

The days normally start bright and sunny but cloud over in late morning, with thunderstorms in the afternoons. Prolonged periods of rain occur when a tropical storm is passing through the area.

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max. Temp. C	28.9	32.2	34.9	36.1	34.1	32.3	31.7	31.1	31.4	29.8	28.3	31.8
Min. temp. C	13.7	14.8	18.2	21.8	23.4	23.7	23.6	23.4	23.0	21.8	19.0	15.1
Humidity %	71	62	56	59	71	78	78	81	81	79	77	74
Rainfall (mm)	6.9	4.6	13.1	50.0	158	131	160	236	227	121	52.8	19.8
Rainy Days	0.9	0.9	1.6	6.2	15.3	16.9	18.7	21.2	17.3	11.1	5.6	1.8
Cloud (1-10)	2.7	2.2	2.3	3.8	6.6	8.1	8.5	8.6	7.7	6.2	4.8	3.6
Visibility (kms)	8.8	8.0	6.8	8.2	11.2	11.9	11.7	11.5	11.4	11.1	10.6	9.7
Hazy days	26.1	27.5	30.4	23.5	3.2	0.1	0.1	0.0	1.1	2.3	7.5	16.8

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