My compost doesn't cook during the winter, I just let it go & only get finished compost in the fall so I'm no help. I add to my pile all winter & layer it with mulched leaves, but I don't turn it much because the yard is either muddy & I don't want to drive the tractor over it, or it's covered in a foot of snow or it's too cold to go out there & turn it OR, possibly, I'm just too lazy! 
