Observing Campaign 24 and 2011 start at the Bok Telescope with mostly clear skies, temperatures around freezing, and very low humidity. Light cirrus was a problem during several periods, but nothing too heavy to seriously hamper spectropolarimetry. Seeing was more of a problem, being very poor (2.5-3.5 arcsec) during the first half of the night. There was a rapid improvement to 1.0-1.5 arcsec after midnight as the temperature rose during the night.
