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What the figures below do not tell, is the number of days a certain region is at or near the temperature extremes. As an example, Chiang Rai will have many more days at 25 degrees than will Phitsanulok.

Region	Temp	Rain	# days	Rainy	Hot	Cool
Bangkok	21-35	1500	127	Sep	Apr	Dec
Chiang Rai	12-32	1700	133	Aug	May	Jan
Chiang Mai	14-36	1100	116	Aug	Apr	Jan
Mae Hong Son	14-38	1300	136	Aug	Apr	Jan
Nan	13-37	1200	119	Aug	Apr	Jan
Tak	14-36	1400	140	Aug	Apr	Dec
Phitsanulok	18-38	1300	117	Aug	Apr	Jan
Petchabun	17-36	1000	129	Aug	Apr	Dec
Udorn	16-36	1400	118	Aug	Apr	Dec
Loei	14-36	1200	126	Sep	Apr	Jan
Nakorn Phanom	16-35	2200	138	Aug	Apr	Dec
Khon Kaen	16-37	1200	106	Sep	Apr	Dec
Korat	17-36	1200	115	Sep	Apr	Jan
Kanchanaburi	19-38	1100	109	Sep	Apr	Dec
Lopburi	20-37	1100	101	Sep	Apr	Dec
Sa Kaew	19-36	1400	131	Sep	Apr	Dec
Pattaya	22-33	1100	106	Oct	Apr	Dec
Chantaburi	21-33	2900	165	Aug	Apr	Jan
Trat	21-33	4700	191	Aug	Apr	Jan
Petchaburi	21-33	1000	100	Oct	May	Dec
Prachuap KK	22-34	1000	110	Oct	May	Jan
Chumphon	21-34	1900	165	Nov	Apr	Jan
Ranong	21-35	4200	194	Aug	Mar	Jan
Phangnga	21-34	3600	194	Sep	Apr	Jan
Surat Thani	24-33	1900	156	Nov	May	Dec
Phuket	22-34	2500	182	Sep	May	Jan
N. Si Tammarat	22-34	2400	168	Nov	Apr	Jan
Krabi	23-34	2200	153	Sep	Mar	Dec
Trang	21-35	2200	171	Sep	Mar	Jan
Songkla	22-38	1700	161	Nov	Apr	Jan
Sathun	22-35	2300	173	Sep	Mar	Dec
Notes: Temp = temperature range in degrees Celcius; Rain = total annual rainfall in millimeters; #days = number of days per year with rain; Rainy = month with most rainfall; Hot = hottest month; Cool = coolest month