What is the best time of year to root cuttings of cereus, epiphyllums, etc.?

Certainly the usual growing season for that particular plant would be the best but wouldn't cuttings take root with appropriate temperature and light? And Winter is not the time to try to root any plant.

I'm in South Texas and have rooted many plants through early Fall through the last five years or so.

Any comments, answers would be appreciated.

Thanks!