Remember that even though the ambient temperature dropped, it takes a LONG time for 6 gallons of liquid to drop to ambient temperature. I have a stick-on thermometer on the outside of my carboys, and it makes it really easy to monitor the actual temperature of the wine.
But if it was only one day, there is no way the liquid inside dropped to 60 degrees from 70 degrees in a 60 degree room.
Broken Leg Brewery
Giving beer a leg to stand on since 2006