Temperatures over the lower part of the valley, where most of the groves are located, will dip into the middle 20s at the core of the cold air.
The cold will challenge record low temperatures in the region which are generally in the upper 20s to near 30 degrees. Lows this time of the year tend to average near 40 degrees.
The lowest temperatures are forecast to occur late Wednesday night into Thanksgiving Day morning, when several hours of below-freezing temperatures can occur in areas between Porterville and Bakersfield.
Oranges are still maturing over the southern San Joaquin Valley and are far from harvest as of late November 2010.
According to Agricultural Meteorologist Dale Mohler, “Low temperatures in some of the groves may dip as low as 24 degrees Thursday morning.”