There are a few standout years (1907, 2003) but this is one of the coldest 9-day stretches we’ve seen during the end of May/beginning of June time frame and ranks up there as one of the top.
1907 was incredible. The cool pattern started May 20 and continued into mid June. DC had highs of 53, 54, 57, 59, and 62 in June alone.