This morning we recieved a degree day update from Silverado Farming Inc:
June is finished, and it is a good time to check back on growing degree days (GDD). The following data comes from the CIMIS station at UC Davis’ Oakville experimental station. In late May, we were ahead of the 10-year average by 58 GDD. Today, we are ahead by 35 GDD. At this time last year, we were 126 GDD behind. This is supported by the notion that harvest will be earlier this season. Berries are pea-sized and starting to touch in many cases, and veraison is weeks away. Early varieties will see seed hardening in the next few days. This season, key phenological markers are taking place at normal timing.
From the chart below, we can see that 2012 (blue) is above the 10-year average (red), but seems to be coming back to average in the last few weeks. The green line, for 2010, represents the coolest season to date in the last ten. The purple line represents 2004, the warmest season to date in the last ten. The take home message is that we are slightly above normal moving into July.