[Syd Thrift]

Originally Posted by dsvitak

Not always.

The mean position of the atmospheric Polar Front, in September, crosses into northern Illinois, from Wisconsin.

Essentially, warm, southerly winds predominate for the summer months, in Chicago.

In September, the winds more often (predominately, in fact), now come from the north, and northeast, off the lake.

This is where baseballs go to die, in Wrigley Field, and was THE main reason for the Cub's collapse in September. This year? PERFECT example. The Cubs, relying on the long ball, just stopped hitting. F7, F8, and F9.

Yes, the wind famously only affects the home team. Also this was an extremely warm September in Chicago terms but mostly, we are talking about that September wind which only blows in when the Cubs are at bat.