I guess -13 degrees is the lucky number. That's how cold it was again this morning. We went to Keystone and only a few more cars in the parking lot but fewer on the slopes. Again we had the slopes to ourselves. With the frigid temperatures snow that falls on the trees remain frozen on the tree limbs. At the end of the day, we watched the grooming snow cats come up the mountain and start their daily routine of preparing the trails for tomorrow.