R/phenology_models.R
    CDD.RdChilling Degree Day (CDD) adapted from Jeong & Medvigny 2014 (Global Ecology & Biogeography)
CDD(par, data)raster or vector with estimated phenophase timing (in DOY)
if (FALSE) { # \dontrun{
estimate <- CDD(data = data, par = par)
} # }