 The corn growing degree-day method uses both a base temperature adjustment and an upper threshold, neither of which are common in viticulture and wine production use, and can confound any comparison with published data using the simple average method.Furthermore, more complex climate indices have been introduced to address perceived shortcomings in the Winkler index including the Huglin Index, the Biologically Effective Degree-Day Index, and the Multicriteria Climatic Classification system (Geoviticulture MCC).These indices attempt to account for day length and solar, frost, and drought variability that can be found in different locations.