Upper Graph: Inside observatory temperature
Lower Graph: Outside observatory temperature
So the highest temperature today went to about 35 C. I kept the roof of the observatory closed and opened it around 22:30. Notice the sudden dip in the upper graph. This shows the sudden release of the heat trapped inside the observatory even after 4 hours of sunset and then the heat loss ratio became stable.
Lower graph shows the temperature loss outside the observatory.. of course no sudden dip around 22:30.