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Xinglong Observatory of the National Astronomical Observatories, ChineseAcademy of Sciences (NAOC), is one of the major optical observatories in China,which hosts nine optical telescopes including the Large Sky Area Multi-ObjectFiber Spectroscopic Telescope (LAMOST) and the 2.16 m reflector. Scientificresearch from these telescopes is focused on stars, galaxies, and exoplanetsusing multicolor photometry and spectroscopic observations. Therefore, it isimportant to provide the observing conditions of the site, in detail, to theastronomers for an efficient use of these facilities. In this article, wepresent the characterization of observing conditions at Xinglong Observatorybased on the monitoring of meteorology, seeing and sky brightness during theperiod from 2007 to 2014. Results suggest that Xinglong Observatory is still agood site for astronomical observations. Our analysis of the observingconditions at Xinglong Observatory can be used as a reference to the observerson targets selection, observing strategy, and telescope operation.

Astronomical Observing Conditions at Xinglong Observatory from 2007 to 2014