Grape Growing Degree-Days for California 

Last Update:  October 12, 2009

Next Update:  March 2010

Growing Degree-Day accumulations are a reasonably good predictor for the rate of grapevine growth during the season and the level of fruit maturity in the fall.  Shown below are the season to date Growing Degree-Days starting March 15 for several grape-growing areas in California.

From March 15 to update date.

Compared to "Normal"  2009 is 
Normal 2008 2009  Ahead (+), Behind (-)
North Valley

Manteca  (CIMIS 070)

3612 3716 3721 +8 days
         
Central Valley

Parlier  (CIMIS 039)

4313 4503 4539 +14 days
         
South Valley

Shafter  (CIMIS 005)

4422 4575 4493 +4 days
         
North Coast

Oakville  (CIMIS 077)

3002 3083 2990 -1 day
         
Central Coast

Atascadero  (CIMIS 163)

3390 3140 3043 -26 days
 

 

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