Sviluppo e validazione di un modello per la previsione delle fasi fenologiche di specie agrarie e forestali

This paper presents a new empirical model for estimating degree days from hourly mean temperature. The model was developed and calibrated using several years of hourly data obtained from five automated weather stations located in California and representing a wide range of climate conditions. The model was tested versus an additional data-set at each location. A comparison between degree-day estimates from the model and other selected methods is presented. The results showed that the model had the best accuracy in general, regardless of the degree-day accumulation season