I replaced my clutch along with the master and slave cylinders a couple months ago. It wasn't fun since I have never dropped a tranny in my life. Anyway, all was done had no issues and has been fine for a while. but lately, especially in the mornings when its been 35 degrees at night (but continues throughout the day), I can push the pedal more than halfway down before i feel pressure. Once its on the floor, just the slightest release hooks it. it used to be probably 3/4 down where it hooked (with new clutch) and now it just seems odd. No slipping, shaking or problems shifting its just annoying me when I release my pedal that it stays halfway down all the time.
Fluids still full, lines bled out.
Any ideas? any input is appreciated. (Flywheel was not resurfaced during replacement even though I know it should have been, too late now I'm not pullin it out until I need more work on it.)

 

I would bleed the slave again.

 

Check the fluid level in the clutch Master Cylinder. A low level can cause the engagement point to be low and near the floor.

Edit-I just noticed that you said that the fluid level is still high.

 

Everythings bled out again, Still problem only happens when its cold I realized. Had a warm day with no problems but today is cold again and the problem persists. I think It might be the return spring above the pedal.