A few months back, my local airfield, 3NM to the west, was giving 'No Significant Cloud' on the ATIS. At this time, I sat, with a nice Chardonnay, watching the TS in the overhead. Down to cost at the end of the day. A great shame, as during the present period of inter-glacial climate change, we need the most accurate Wx obs we can get our hands on.