Weather Station Siting: Effects on Phenological Models

Accurate temperature data is important for both the development and use of phenological models, and this chapter discusses topics related to temperature measurement for use in phenological models. The chapter presents a short history of temperature measurement, the theory of temperature sensors, radiation shielding, and guidelines on weather sensor placement. Physiological time (degree day) calculation and its application are described. The impact of underlying surface, fetch, and surrounding environment on temperature and phenological time are discussed and some guidelines on measurement are presented.