Question

Why does it become very difficult to open and close a door in winter?

Answer 1

it becomes difficult because its intermolecular space increases and hence its area become large

Answer 2

Humid summer weather sometimes brings an irritating byproduct -- sticking doors. Moisture in the air is absorbed by the wood in some doors. The wood swells and the doors become difficult to open and close.

Some doors stick even in dry winter weather, of course, so a balky door can be a year-round problem.

The first impulse of many do-it-yourselfers is to shave wood off the door edge with a plane or rasp, but this often isn't needed. Try these some simpler steps before removing any wood.

Check the hinges. Some doors are quite heavy; constant opening and closing puts strain on the hinges that can cause screws to work loose. Simply tightening the screws will cure many sticking doors. If the screws seem loose in their holes, however, the repair might be short-lived. For a more lasting repair, remove the old screws one by one and replace them with screws of the same diameter but one-half inch to one inch longer. Screws with oversized holes can also be tightened, at least temporarily, by inserting several pieces of toothpicks or some steel wool into the hole.