Thank you for this post! This is very good to know in case we have a cold summer and I need to give them a cooler-than-indoors dip in fall/early winter to get them spiking.
As a caveat, my Phals have been given a chance to acclimate. They’re introduced to the great out doors during the warm part of the year. I’ve read posts by other users where sudden temperate drops into the low 40s due to a power outage led to death.