This is getting to be a trend--Monday=crappy year.
Just checked back a bit & you are more right than I suppposed. The farthest back Dave has gone on a Monday since summer began is '77 (not counting a classic from '76 when he was on vacay last month).
On June 13 we got a '73 set, which I recall greatly surprised us all.
ETA - This is, however, a perfect theme song for our Monday year-o-set blues: "That's Just The Way It Is Baby".