That's for extent, but for area, we've seen August minimums. I believe 1992 was 8/31 and 2005 used to have an 8/30 min but recent revisions to the NSIDC database now has 9/3 as barely edging out 8/30 for the min.
But 8/23 is ridiculous for a min....if an August minimum on area would occur, it would be around the last day or two of the month.