So as I may have already mentioned, it was about 100 degrees F in St Louis last week when we visited.But I wanted to go to the zoo, so here we go....we waited until Friday afternoon. It was right at 100. Of course. OK so when you enter the parking area...did I mention the admittance to the zoo is FREE? You only have to pay $15 to park if you choose to drive to the zoo. Imagine if you took the bus...you could do the zoo for like under $5. Actually if you had a carload of people, you could really come out pretty economically.