started collecting cloud data

For the first time I grabbed the sky sensor data captured at the Burke-Gaffney Observatory. I missed the memo about this new device (a Boltwood Cloud Sensor II) and the web page showing the daily, weekly, and monthly charts.

The charts show the cloud cover with the green bars. The higher the green level the better the sky, i.e. it is clear. The value 40 is the maximum. A low value like 20 indicates very cloudy.

The blue line on the chart shows the difference between the air temperature (nominal values, like 6°C) and the sky temperature (usually very close). High numbers suggest clear skies.