My Sliding Patio Door Sticks In The WINTER!!! HELP!!!!? I have a wood and cup style sliding patio door that we...

I have a wood and cup style sliding patio door that we use to win into our upper apartment. When it gets cold out it get close to imposible to get unambiguous! I tried to put WD-40 in the track to help out lube it...no luck :( I think the wood is swelling beside the temp change...what is the trick? Its one and only going to get worse the colder it get.... :( HELP!!!!
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Answers:    Why dont you just adjust the door?

The casters that most sliding doors ride on, are adjustable (up and down), this allows you to square the door up to the initial, or in this crust, for winter, to lower both just a bit, so its not so tight surrounded by the frame. (Or raise it a bit, if its dragging on the bottom, hehehe)

I typically adjust a slider, consequently move it to within an inch of the latching jamb... checking to produce sure I keep it parrallel.
If the jamb is bowed within at the middle, then there's probably a shim or two that wants to be removed from behind the latch plate.

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How long does a solar powered flashlight ending...
Silicone would be the better alternative.