Thedryseasonoccursbetween
November andMarch;therainyseasonisfromMaytoOctober,
with thewetterperiodoccurringbetweenAugustandSeptember.
Average annualrainfallis1379.1mm.Withapproximately80%of
the rainexperiencedduringtherainyseason,extensiveflooding
is oftenencounteredtowardtheendoftherainyseason.Mean
minimum andmaximumtemperaturesare16.6 ◦C and35.9 ◦C,
respectively (Thai MeteorologicalDepartment,2012). InThailand,
different taxaof Bithynia snails havetheiralmostexclusivegeo-
graphic distributions;thespeciesfoundinnortheastThailandis
Bithynia siamensisgoniomphalos (Sithithaworn etal.,2007).