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2050 GDD Forecast
1980
Winkler regions
The five climatic zones, or Winkler regions, for California, showing the heat summation index for the period of April 1 through October 31 using the GDD formula.
REGION I (<1390°C) REGION II (1391–1670°C) REGION III (1671–1940°C) REGION IV (1941–2220°C) REGION V (>2220°C)
Technology Showcase 211
