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Background and Aims: This paper describes the changes in temperature-based indices used to classify viticultural climates in Australia for three warming scenarios produced by the Commonwealth Scientific and Industrial Research Organisation: Mk3.0 global climate model for the years 2030, 2050 and 2070. Methods and Results: Temperature indices that describe grapevine growing season temperature (GST), ripening period temperature, accumulated biologically effective degree days and growing season length were calculated to produce maps of Australia for each warming scenario. Summary statistics of each index's median and range are presented for each Australian wine region under each warming scenario. The greatest change in GST (above the 1971-2000 mean) was modelled to occur for the Perth Hills region, increasing by 1.0C by 2030, 1.9C by 2050 and 2.7C by 2070. The least change in GST was modelled to occur for the Kangaroo Island region, increasing by 0.5C by 2030, 0.9C by 2050 and 1.3C by 2070.
Hall et al. (Sun,) studied this question.