The temperature is not too low. People grow them outside on trees in southern California with a similar temperature range to yours, and cold winter rain any time between October and April.
In habitat it is true they receive no rain in winter. If mounted you could move it under a cover during a winter rainy spell, then move it back when the weather dries.
About a year ago Roberta mentioned they only produce roots once a year, so it is best to wait to move them until new roots are just forming.
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