I have been data gathering for almost a month now.  Here is the last week's data.  Saturday and Wednesday were foggy days!  Typical SF summertime weather...
And for the last month:
When the panels where dry, before I turned on the controller/pump, the low was about the same, but the high was 190 C (375 F), not 90 C (194 F).  Most of the cooler days indicate presence of our lovely fog.


