We managed 67.7 kWh yesterday. 67.3 kWh today.. A perfect day yesterday and very nearly perfect today too. Like many others though, no record days. The 69.2 kWh on the not perfect 2nd June was still better due to lower temps, and probably slightly lower sun angle. Our peaks are so much higher in the winter I don't think the temperature alone can explain the difference. We have no shading either, so I think the the sun being so high in the summer has negative effect on the pitched panels in the summer.
Looking at the 10 second average peaks:
Peak 25th June: 7,898 W
Peak 2nd June: 9,030 W (after cloud, 8.4 kW sustained in direct sun)
Peak 21st April: 10,804 W (high peak, but it did hold >10.5 kW for over 5 minutes during this cloud break window)
For temperature alone to explain this, the panels would have needed to be >100 C yesterday. I'm sure they were hot, but probably not that hot!