yeah 3km NAM quite impressive with how it keeps the low lvl cold air locked in.. weak SLP along the south coast reinforces the northerly drain in the afternoon. Not a lot of QPF and marginal temps, but still thats the coldest run I've seen yet.
For KBOS past 30ish years:
10/10/2018 86
10/9/2011 87
10/10/2011 85
10/4/2007 86
10/2/2002 85
10/6/1990 86
10/7/1990 85
90 after 10/1:
10/7/1963 (3 days 85+, including 86 on 10/27 - latest 85+ on record)
10/12/1954 (4 days 85+ this month)
10/1/1881