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The Winkler scale, sometimes known as the heat summation method, is a technique for classifying the climate of wine growing regions.〔("Winkler’s climate regions" ) ''Wine Wisdom''. Retrieved 2015-3-30.〕 In the system, geographical areas are divided into five climate regions based on temperature, known as Regions I–V. The system was developed at the University of California, Davis by A. J. Winkler and Maynard Amerine.〔("Wine Climate" ) UC-Davis Department of Plant Sciences. Retrieved 2015-3-30.〕 ==The system== The system is based on the hypothesis that grapevines do not grow if the temperature is below 50 °F (10 °C). Days in the growing region (assumed under the system to be April 1 through October 31 in the Northern Hemisphere; October 1 through April 30 in the Southern Hemisphere) are assigned degree days according to the amount that the day's average temperature exceeds this threshold; one degree day per degree Fahrenheit over 50 °F. In places where SI units are preferred, degrees Celsius over 10 °C may be used, but should be multiplied by 1.8 to convert to Fahrenheit degree days for the following list. All days in the locale are then added up, with the sum used to determine the region's classification as follows: * 2,500 degree days or less: Region I * 2,501–3,000 degree days: Region II * 3,001–3,500 degree days: Region III * 3,501–4,000 degree days: Region IV * Greater than 4,000 degree days: Region V The system is used officially in California, and other United States growing regions such as Oregon and Washington. It is less widely used elsewhere; however degree days can be computed for any location for which detailed climate data is available. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Winkler scale」の詳細全文を読む スポンサード リンク
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