This page provides a graphical interface to historical data (beginning May 01, 2007) provided by the cloud sensor and skyprobe operated at the CFHT Observatory atop Mauna Kea.
Choose a date range to graph.
Press the chart button to view the charts based on your criteria.
The Default button is the default chart provided by partners of the cloud sensor device manufacturer. It charts data throughout the day and night in realtime.
There is no auto-refresh of the charts. Hit the chart button to get updates once you have your criteria selected.