I mean, yeah probably, but there are also 6 Februarys from 1875 to 1899 that featured 70s for highs (1883 hit 76). Obviously, not as reliable, taken downtown, blah, blah, blah, I know, there definitely wasn't as large an urban heat island back then either. Point is there were warm and snowless winters over 100 years ago too. One year isn't a pattern.
Meanwhile, in these last 25 years we've hit 70 in February...the same, 6 times, with a three year run from 1999-2001.