We model the rate at which grapevines mature by counting the amount of time the temperature is between 10oC and 19oC.
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Weather data model for this Vintage - ABOVE - explains why harvest in McLaren Vale began during late January and early February.
Willunga has an accumulated BEDD of 1240 degrees for the season so far. The previous three year average is 1171 degrees.
Temperature accumulation from the middle of October to December 2014 (blue line) was higher than the average of the last three years (orange line). Grapevines flowered and matured at a quicker rate in response. Harvest began early because of a warm spring which caused flowering (EL-19/27) to be completed early.