Answer: Camellias grow well in the southeastern US and so heat/humidity is not a problem. However, most camellias are only cold hardy to zone 7 or 8 at most. Recently there are some newer ones being developed and released -- hybrids with C. oleifera parentage -- with an eye on increased cold hardiness well into zone 6 or temperature ranges of possibly -5 to -15 once they are well established. If you have one of these (many have the word "Winter" in their variety name) and can site it in a favorable microclimate, then it should do well for you.
Here is additional information about what are referred to as the Ackerman camellias.
Certainly it is easier to care for a shrub planted outside year round than to try to bring one indoors every winter, provide adequately cool winter temperatures, and also force it to acclimate twice a year in additiopn to maintaining it as a container plant.
Enjoy your camellia!
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