The church kitchen set, in which the girls prepare Christmas dinner in, was the kitchen set used for the Above the Top Restaurant in Los Angeles's Bonaventure Hotel on the Witt/Thomas/Harris series It's a Living. That series had recently ended its six season run in May of 1989.
Apparently, it is warmer than usual around Christmastime in this episode. In real life, however, record cold temperatures were recorded all over southeast Florida in December 1989.