In June 2012, DCA put up a 104 and had five days of 97+.
In 2011, they hit 102 and had three days of 98+ within the first 10 days of the month.
In 2010, they had seven 95+ days.
In 1994, they hit 90+ for fourteen straight days from 6/13 to 6/26, including a 101.
In 1959, they had three straight days of 99, 100, and 100. Also nine 93+ days.
In 1952, they had eleven 93+ days, including three straight days of 98, 101, and 98.
In 1925, eight of the first ten days of the month hit 94+, and there were three straight days of 99+, including a 100.
In 1911, they hit 101 on 6/11.
None of what's happening this month is unprecedented, hasn't happened earlier, or is in fact as extreme as these other events.