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From a building design perspective the change you must make is either:
A. Reduce absolute humidity of air at the window, or
B. Increase inner surface temperature of the window
Since you don’t want to lower the R.H. of your humidifier you can also achieve A by lowering the thermostat. This will reduce the absolute humidity for the same R.H.
B. can be achieved by either replacing windows with better performance or by locally heating the air at the window with something like a baseboard heater or film insulation as suggested above.
It sounds like you have a central furnace with forced air distribution. Do you have diffusers near these windows? If so you could play with the balancing dampers to provide more airflow here.
Cycling your fan on more often or constantly might help with A. by averaging your house R.H. more evenly, or it might make it worse depending on where your humidistat is and the unit’s control logic
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