Your father has been a very strong and faithful elder for decades, i served with him for a while and he's behaving in such a way with you ( asking you about the weather) he really does not have much to talk about or have much in common with you anymore because you have become inactive and without faith in the watchtower : " MOTHER ORGANIZATION", he cannot talk to you about meetings, latest "new light", convention and so on because you are living in a complete different world than he is. There is not much in common anymore and the sooner you accept that the sooner you'll be able to move on with your life and live a happy life with your wife and daughter.
I have been thru it many years ago, had family and friends by the hundreds in many different states and none of those "brothers, friends and relatives" talk to me anymore.
The only hope if your father starts doing some thinking himself about the organization and come to conclusion that the watchtower is not the " truth" but just another religion with its interpretation of the bible .....but don't hold your breath on that. It took me 32 years to realize that and the same amount time yourself to see what the watchtower is all about.
Hang in there and do best best to cope with it.