As we can clearly see that the summers attracted much more visitors than winters did . One of the very reason this might have occured can be the holidays, people during holidays often visit museums be it due to interest , as a date idea ,etc.
But with winter people are busy with their daily chores their daily work life so they just give up on the idea of visiting the museum resulting in the graph we see here.
The museum was getting visitiors the minute they opened their doors and stayed above 800 average visitors during the complete hours the museum was open , but on the contradictory the winters were neither able to get many visitors during the morning nor were they able to keep the visitors hooked in the museum as all of them vacated the museum between 14 hrs to 15hrs .