Short-term effects of meteorological factors on hand, foot and mouth disease among children in Shenzhen, China: Non-linearity, threshold and interaction

•Temperature and wind are positively associated with hand, foot and mouth disease.•There were thresholds for the effects of relative humidity.•Low and high thresholds of relative humidity were found at 45% and 85%.•There was non-significant interaction between weather variables on HFMD.