GAM-estimated relationships between average monthly dengue cases and average monthly Tmin (A), Tmax (B), Humidity (C), and precipitation (D), all lagged 1 and 2 months. The x axis represents increasing variations in the meteorological covariates. The y axis indicates the contribution of the smoother to the fitted values. The y axis is labelled s(cov, edf), where cov indicates the name of the covariate, and edf represents the estimated degrees of freedom of the smooth function used to represent its relationship with number of dengue cases. The red lines indicate the maximum likelihood estimates, and the grey shaded areas represent the 95% confidence intervals. The rug at the bottom of the figures indicate observed values of the covariates.