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Your house is a system, not a collection of individual parts. You have BOTH a humidity problem and a window problem that presents itself when you have an outdoor air temp problem. The lack of insulation in and around the windows is allowing them to conduct the old form the outside to the inside and when you get below the dewpoint, given the humidity in the room, condensation forms.
We have aluminum framed windows in our house that love to conduct cold from the outside. In the winter we have to leave the shades open to get enough airflow in there to avoid condensation. We have one particularly troublesome window where we place an electric radiant heater under it when it get really cold out. Just to bump the temp up that extra little bot to ward off the condensation.
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