Weather
Houston is plagued by poor weather much of the time. On the nights of the
observatory open houses, check the open house page
around sunset or later to make sure it
will not be cancelled due to clouds. If it is raining, or has rained
significantly during the afternoon, the observatory will be closed. The
following links from George Mason University, Clear Sky Clock, and
the National Weather Service
can be helpful for observation planning and to predict
when the atmosphere is likely to be clear with minimal turbulence.