Mark Williams is working on the SQM maps and the latest one is available here. Hovering over a square, the number of readings made, average and best SQM readings for that area are displayed. There is also a key to the colours used below the map (Bortle Scale)
Full SQM Readings Table
The complete set of SQM readings from the observatory to date is available here.
Please note: This file is quite large and is converted to a table format “on the fly”, so it may take some time to load
The first 4 columns are probably the most important, Date, Time, SQM Reading, and Naked-Eye Limiting Magnitude.
The latest SQM reading from the observatory in Watery Lane is shown below.
Please Note: You may need to refresh this page manually (Press Function key F5) to see the reading if you have visited this page previously.