[teddy bear]

Our house humidity level is 60% and its about 45 degs outside. In the winter last year I was in the 40's when we had the oil furnace heat on.

Would the new NG furnace create more humidity or not lower it like the oil heat did or is it just because we haven't been running the heat very much yet and the humidity hasn't stablized ?

I gotta quit thinking of this stuff

I run a dehumidfier in the basement kept at 50%

Two weeks ago we were at higher outdoor dew points throughout the northern US. Your home was at 73-75^F with ??%RH (55?). This week you cooled down inside to 68^F, 60%RH. Every degree of temperature drop increases %RH by 2.5%. 6^F drop = 12%RH increase. The dew point of the outside air is currently 50^F.
http://www.weather.com/maps/maptype/currentweatherusnational/uscurrentdewpoints_large.html
Your indoor dew point is 53^F. Occupants add moisture to the outside air that slowly infiltrates your home. This explains the rise in dew point. Sounds normal to me. Ok to think about if you understand what's happening. As the outdoor air gets colder, the stack effect pressure will increase. The increased pressure will increase the air change rate of the home. Wind also makes the home change air. My thoughts are that you should make sure you are getting and air change every 4-5 hours when the home is occupied. During spring/summer/fall, adequate air change requires a fan of some sort. A good bath fan operating when the home is occupied would do. The cost of conditioning 75 cfm of fresh air for 12 hours/day for three seasons is <$100. Think about a high efficiency ventilating whole house dehumidifier (thermastor.com) for perfect control of fresh air and humidity throughout your home. For now, operate the fan when the home is occupied until the %RH drops below 50%. I am attaching data from a WI home which is in northern US like you. This home has 60 cfm of fresh air 14 hours per day. Regards TB