It depends a lot on the genetics, and whether when it is quite warm, they are getting GOOD AIR FLOW. By that I mean fresh CO2-rich air, not just fans blowing inside the room.
Try opening your window as soon as the outside temp falls below the inside temp, and putting a box fan in the window to cool it faster so that you don't get that spike to 90.
stinkyattic Reviewed by stinkyattic on . this one is for stinky! well lately it has been getting colder here but still hot in the days. i run my lights at night and have been opening the window letting all the cold air in.. When my light is on at 8pm-8am my temps start out at 80 then goes to 90 for an hour or so and they drop every hour down to 75.. when my light is off during day time i close my window and keep the ac at 75 in my house but my temps are around 78-80 my question is,, with temps like this are my plant going to go hermaphrodite? one Rating: 5