†Each model used negative binomial regression and used
generalized additive models to estimate degrees of freedom for
non-linear (i.e. spline) variables. ‡Changes in AICc
and relMAE compared all models to the reference (model 1), a seasonal
variables-only model that contains calendar week, average weekly
temperature, and average weekly relative humidity. Abbreviations: ∆AICc,
change in Akaike’s Information Criterion corrected for small sample
size; RH, relative humidity.