High humidity and strong gusty winds throughout the night. Lost an hour of observing about 1 hour after opening to fog coming over the top of the mountain from the lower slopes. At about midnight, a cloud cap formed over the mountain putting an end to observations for another 2 hours. All available Fermi/LAT-monitored blazars targets, but one, were polarimetrically observed. Seeing was anywhere from 1.0" to 3.5".