the peninsular region, which extends from the Gulf of
Thailand as a long belt, is characterized by mountains stretching southward with an altitude up to 1800 m a.s.l.
Rainfall distribution depends on topography that faces
the dominant monsoon winds. Following the seasons,
these winds are from the north-east (dry monsoon) or
the south-west (wet monsoon). Northeastern winds
bring less than 50 mm of rainfall to Thailand during
January, while southwestern winds bring up to 400 mm
of rainfall during July, depending on the location. The
rainy season is longer here than in the northern parts of
the country, and rainfall rates are higher throughout the
year.