Plants just started Flowering, but Outdoor Temps are dropping, What to do?

up in Alaska, Got a greenhouse grow going, Initially planned to breed some seeds to have backups as well as having some that flower sensimilla, temps are dropping pretty quick (it's getting to low 50s high 40s at night), and rain is nearly daily. Plants are maybe 1-2 weeks into flower and are longer autos, (was initially told 60-75 days is usual harvest for this variety but that dont feel right) thinking 80-90 days ish, currently on day 67, should I let them keep going or was this season a bust? I am able to bring 2 plants inside for breeding purposes, but I've got 6 and they're all pretty big, 3-4 ft tall maybe 1.5ft wide (didnt do any training until later because I wanted to see how they grow naturally) Newer to Growing, this would be my first successful harvest, but my 4th attempt growing. Any input is welcome.

i say keep going and learn the process, the more you learn the less you fail in the future. learn what works for your conditions, you might need to dig down in the ground if possible for extra heat, you may need heat mats, you might need nothing extra because you have a great idea.

Is the temp change temporary or are you that far North were it won't rise again ? They can ride out a few days of low temperatures . Continuous rain is another thing altogether .

can you putsome space heater in there?

They are tough, I have had them hit 40's before. As long as the rain doesn't give em bud rot. In the mornings try to shake the dew off and you should good. Is the weather looking like it will bounce back?