[GpsFrontier]

It's normal to have outside humidity in the 80's or 90's when it's raining, even afterword. Typical for your area I would expect around 50-60% humidity normally on a nice day. 20% difference between inside and outside would probably be normal. But beyond 30% difference I would say something in your home is acting as a dehumidifier, HVAC system etc. or your humidity sensor/s are off. Especially when you say when you got up today your humidity was 16%. That's just too much of a difference to make scene naturally. There is no way your humidity should be that low in your area. That level is equivalent to the desert (where I live) during the hot dry July and August months. Even at 30% indoors now, that's about a 50-60% difference between inside and outside. Why is there such a drastic difference??