An unsupervised software "robot" that automatically and robustly reduces an
d analyzes CCD observations of photometric standard stars is described. The
robot measures extinction coefficients and other photometric parameters in
real time and, more carefully, on the next day. It also reduces and analyz
es data from an all-sky 10 mum camera to detect clouds; photometric data ta
ken during cloudy periods are automatically rejected. The robot reports its
findings to observers and data analysts via the World Wide Web. It can be
used to assess photometricity and to build data on site conditions. The rob
ot's automated and uniform site monitoring represents a minimum standard fo
r any observing site with queue scheduling, a public data archive, or likel
y participation in any future National Virtual Observatory.