My front door is solid wood and in the summer it swells making it difficult to latch the deadbolt (I have to lean my weight into the door to latch from the inside or pull on the handle from the outside to latch it).
In the winter the door latches without issue. If anything it feels "loose" in the latch during the winter.
I'd like to modify the door or the frame/jamb to make it easier to latch the deadbolt.
What do I need to do to determine what the specific issue with the door is and how can I modify the door to easy to latch in all seasons.