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Thailand is located in the tropical area between latitudes 5degrees 37' N to 20 degrees 27' N and longitude 97 degrees 22' to 105 degrees 37' E. The climate can me divided into three seasons as follows.

  1. Rainy (South West Monsoon) Season - mid May to mid October
  2. Winter (Northeast Monsoon) Season - mid October to mid February
  3. Summer (Pre-monsoon) season - mid February to mid May

The best time for flying in Thailand is from October to May although just because its rainy season doesn't mean that it rains all of the time. On the contrary I've had some pretty good flights during rainy season as conditions are very unstable. On the whole the best time to fly is January through to April so try and plan your trip during this time. The cloud base is never more that 1,500/2,000 feet. Below I have outlined some historic weather statistics from the Thai Met office.

Mean Monthly wind speed (knots) in Thailand
Month
North
Northeast
Central
East
Southeast
Southwest
Jan
1.3
2.6
3.2
3.6
4.5
4.4
Feb
1.7
2.6
4.0
3.6
4.8
4.1
Mar
2.3
2.7
4.9
3.8
4.6
3.6
Apr
2.8
2.6
4.8
3.5
3.9
2.8
May
2.3
2.5
4.1
3.5
3.4
2.9
Jun
2.2
2.7
4.3
4.3
3.8
4.1
Jul
2.3
2.9
4.1
4.1
3.8
3.7
Aug
2.1
2.7
4.o
4.2
3.9
4.3
Sep
1.5
2.0
2.9
2.9
3.4
3.6
Oct
1.3
2.6
2.7
2.9
2.8
2.5
Nov
1.3
3.1
3.3
4.1
3.5
2.7
Dec
1.3
2.9
3.4
4.4
4.5
4.2

Mean Monthly Prevailing Wind in Thailand
Month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Chiang Mai
S
S
S
S
S
S
S
S
S
N
N
N
Chumphon
E
E
E
E
W
W
W
W
W
E
NE
E
Hua Hin
NE
E
E
SE
SW
SW
SW
SW
SW
W
N
N
Loei
E
E
E
E
N
W
W
N
N
N
E
N
Mai Sot
W
W
W
W
W
W
W
W
W
E
E
E
Phetchaburi
NE
S
S
SE
SE,S
S
S
S
SE
NE
NE
NE
Phatthaya
NE
SW
SW
SW
SW
SW
SW
SW
SW
NE
NE
NE
Phuket
E
E
E
E
W
W
W
W
W
W
NE
NE
Rayong
N
S
S
S
S
SW
SW
SW
SW
SW
N
N
Shikui
NE
NE
NE
S
S,SW
SW
SW
SW
W
NE
NE
NE

Relative Humidity (%) in various parts of Thailand
Region
Winter
Summer
Rainy
Annual
North
73
62
81
74
Northeast
69
65
80
72
Central
71
69
79
73
East
71
74
81
76
SE Coast
81
77
78
79
SW Coast
77
76
84
80