One of the ardent advocates of PEDs have no effect on basbeall. There is a chart mapping AVG temperature versus HR/PA in April/May.

From what I see at first galnce, the case is compelling but, but, if AVG temp goes up, then HR/PA should go up. if it goes down, then it should go down.

There are nine data points with 1998 as the start. Only six show the AVG going up or down with the HR/PA moving the same way. I'm not sold.