Unless they are to big and bulky to move outside, any temperature and/or humidity gauge can be placed outside. Even if it isn't water proof it can be placed outside for 30 minutes or so when it's not raining. Or even placed under a patio roof to shelter it from the rain. If It were me, the first thing I would want to do is test those meters by placing them outside. Then see if they give you the close to the same readings you are finding online. I would move them back and forth a few days in a row to see if they read the change between inside and outside consistently. If it's reading the outside humidity correctly, chances are it's reading the inside humidity correctly as well. But if your not getting good outside readings, your probably not getting good inside readings either.
Then if they seem to be reading correctly, I would probably call a HVAC company and ask them if that type of drastic difference between inside and outside humidity levels is normal. If so, ask them what is acting as a dehumidifier? I see in your area it's cold, perhaps your home is closed up tight all day and the HVAC system is dehumidifying the air all day while it heats the home. Where I live we don't need to close the house up tight, and don't need the heater much during the day, and only sometimes run the heater much at night (even during winter). However we do use the AC all day and night during the summer, but until monsoon season there is very little difference between inside and outside humidity during summer.
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