Oranges generally won't ripen once removed from the tree.
According to one vendor's site, honeybell oranges ripen only in January. http://www.hyattfruitco.com/land_honey.shtml
I'm afraid there is no straightforward answer to this. There are many varieties of oranges and they all ripen during certain times of the year. So you could have a constant supply of oranges if you had enough trees.
It depends on whether the orange is picked or not. An orange does not continue to ripen after being picked. You might have heard they ripen quicker in the dark because in tropical areas it takes a cool night for the vivid color to set in. However, the oranges color does not always indicate its ripeness. For instance, most Florida oranges are dyed in order to enhance their appeal to consumers.
Ripen
Bitter oranges may remain green even when ripe, so observe other ripeness signs like softness and fragrance. Ensure the tree receives adequate sunlight, water, and nutrients. If they remain green and lack flavor, it could be due to the variety of oranges or environmental factors.
According to established Florida citrus mail seller, Hale Groves, oranges and grapefruit do not continue to ripen once picked. But many other fruits and vegetables do.
Bananas are green until they ripen. Then they are yellow.
Vegetables don't ripen after being picked.
Purple and green and oranges
well, if you LIKE green bananas: eat it. if you DON'T: wait for it to ripen
Oranges. Pears are green or brown and a completely different shape!