From the winter growing guidelines sticky:

"Winter growing conditions for spring bloom.
...
Air Temps: Air temps need to be kept at and below 68*F / 20 *C for total of 750-850 hrs with out going above 75* F / 23.8* C for more than 7-12 consecutive days that will break bud dormancy. (try to keep soil temps above 55* F/ 12.7* C to keep the roots active to provide water and nutrition to the leaves) "

Does this mean >75F throughout the entire 7-12day period, day and night? Or just daily highs above 75F even if the air temp drops at night?

I see >70F on sunny days where it is ~50F outside, though I don't expect it will last more than a few days at a time.