High Quality Content by WIKIPEDIA articles! The Winkler Scale, sometimes known as the heat summation method, is a technique for classifying the climate of wine growing regions. 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. 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.

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