What is the Winkler Index (WI)?

The Winkler Index or Winkler Regions, is a technique for classifying the climate of wine growing regions based on heat summation, or growing degree-days over 10°C, from 1 April until 31 October. (Wikipedia, The Free Encyclopedia)
Region 1a     850 – 1,111 °C (annual temperature data)
Region 1b    1,111 – 1,389 °C
Region 2     1,389 – 1,667 °C
Region 3     1,667 – 1,944 °C
Region 4     1,944 – 2,222 °C
Region 5     2,222 – 2,700 °C

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