I'm in 8b in Charleston, South Carolina. It's HOT and humid during the growing season.
My friend close by grows Satsuma oranges.
I successfully grow Meyer Lemon, grapefruit, Pom 'Wonderful', and Persimmon 'Fuyu'. The citrus didn't produce this winter, as last winter we had a VERY uncharacteristic week-long freeze with snow on the ground! Young plants may need covering in even short periods of.freezing weather, but when they get more mature, they seem to do well.