Climatic factors influencing dengue cases comprise of monthly average rainfall, vapour
pressure and maximum, minimum and mean temperatures (Hales et al. 2002). Temperature,
humidity, rainfall, and wind speed affect the incidence of dengue, either through changes in the
duration of mosquitoes and parasite life cycles or through their influences on human, vector, or
parasite behaviour (Gubler et al. 2001, Wongkoon et al. 2013). Our results showed that relative
humidity was strongly correlated with dengue cases in Muang Nakhon Si Thammarat, Thailand.
This indicates that mosquito eggs tend to be more viable in high humidity. Local community
should be warned during dengue high risk period as relative humidity increases.