Which statement about the GST model is true?

• A. It uses the annual mean temperature
• B. It relies solely on rainfall data
• C. It is not related to the growing season temperature bands
• D. It uses the mean temperature of the whole growing season and bands from cool to hot

Answer: (D)

GST model measures climate impact on grape growing by using the mean temperature during the growing season and interpreting it through bands from cool to hot. This approach captures how much heat grapes receive when they actually ripen, which drives sugar development and phenology. That’s why the statement describing the model as using the mean temperature of the whole growing season and organizing regions into cool-to-hot bands is the best fit. Using an annual mean would miss the crucial growing-season heat, and relying on rainfall data ignores the temperature-driven aspects that GST aims to represent. The model is inherently tied to growing-season temperature bands, not to rainfall alone.