Cloud Free Night is a non-profit online weather forecast information service, for the benefit of the Australian and New Zealand astronomy community. It is unique in offering a comparison of the widely available forecasts from the United States GFS global model with higher resolution forecasts from the Australian Bureau of Meteorology ACCESS model. The Cloud Free Night website has also been optimised for mobile devices.

It uses two prediction services to predict cloud cover in 3-hour intervals at many locations, plus cloud maps, rain and fog.

http://www.cloudfreenight.com/meteogram.html