Dollar sales also were down, declining 10 percent for the same period, according to Nielsen retail sales figures published by the Florida Department of Citrus.
The largest drop came from reconstituted orange juice, which saw declines of 10.2 percent in volume and 8.6 percent in sales. Sales of that produce fell to an all-time low of 1.71 million gallons during the four-week period.
For the 2013-14 season to date, total orange sales are down 5.3 percent by volume and 5.2 percent by sales.
The average price was $6.31 per gallon retail, up 2.4 percent year over year, according to the report.
Industry experts point to a smaller orange crop for much of the price increase.
The U.S. Department of Agriculture has forecast that Florida growers will harvest 110.3 million 90-pound boxes of oranges, the smallest crop in 24 years. Most of Florida's orange crop goes to juice rather than fresh.
Growers blame citrus greening, also known as huanglongbing or HLB, for much of the production drop.
Grapefruit juice sales declined even more, falling 10 percent by volume and 8.4 percent by sales.
The average retail price for grapefruit juice was $7.11 per gallon, up 2 percent year over year.