- I suspect two issues - inadequate light and improper watering, not the outside temps.
Keep your Monstera very close to the east window and make sure the window is completely uncovered - no sheers.
Watering can be a problem if that pot does not have a drain hole. If so, then allow the top inch of soil to dry before slowly adding just enough water for the top inch to dry out again in about a week. Experiment a bit to determine what the right amount of water is.
You may want to trim off the discolored leaves as they will not recover.
I hope this information will give you sufficient mastery of it.