Hey Stronic, good temperature to keep ur plants @ is between 20 & 25 Degrees Celcius.. Optimum is 24 Degrees.
Anything higher will give ur plants stress and make ur plants stringy with very light/weak bud, and anything lower will giv u stunted growth with reduced root size and deformed plants..
As to wether or not they survive - during winter i grow plants under lights to veg, n to flower i just move them outdoors n temps here get down to 10degrees celcius & lower at night n at dawn.
So they will survive, just keep a close eye on them and give them extra good tlc.
Good Luck.