Abstract
This study focuses on the northward shift of homogeneous agro-climate zones in Europe analyzed for the observed past and projected climate conditions for the next decades. Statistical cluster analysis is used to derive eight main agro-climatic zones driven by two agro-meteorological indicators, namely, active temperature sum and thermal growing season length. The northward shift of homogeneous agro-climate zones and the corresponding change of crop growth suitability are analyzed together with the change of exposure of crops to temperature-related climate extremes during the growing season. Gradual warming over Europe has contributed to a lengthening of the growing season and an increased active temperature accumulation, accompanied by more frequent occurrence of warm extreme climate events. Using a set of five high-resolution regional climate scenarios, we calculate that a major part of Europe will be affected by further northward climate zone migration. In the next decades, the migration of agro-climatic zones in Eastern Europe may reach twice the velocity observed during the period 1975-2016. Several regions of the Mediterranean may lose suitability to grow specific crops in favor of northern European regions. This indicator-based assessment suggests that the potential advantages of the lengthening of the thermal growing season in northern and eastern Europe are often outbalanced by the risk of late frost and increased risk of early spring and summer heat waves.