Why do summer Valencia oranges sometimes seem to look green and unripe?
Valencias, because they are ripening in the warmer months, are subject to a phenomenon known as REGREENING. The oranges turn golden before they are fully ripe. As the weather gets warmer and they hang on the tree to ripen, they actually begin to turn green again, starting at the stem end. Regardless of outside color, oranges are never picked until completely ripe.
