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For no particular reason at all except to see what I could see, I started keeping a log of record high info for the Philly area as presented by one of the local TV weather girls - started last April - since she doesn't present the info every night, I've got only 14 entries, but they do represent a random sample since she seems to present them when she has time and gets around to it - format is: Date, average high, record high (date of record high);
April 9, 62, 90 (1929); April 16, 64, 88 (1941); April 18, 65, 94 (1976); April 21, 66, 89 (1979); April 23, 67, 91 (1960); April 29, 69, 90 (1974); May 13, 73, 93 (1881); May 19, 75, 96 (1962); May 25, 77, 96 (1991); June 6, 80, 100 (1925); June 8, 81, 99 (2011); June 11, 82, 95 (1986); June 12, 82, 95 (2015); June 25, 85, 98 (1952).
I know, I know, it's much too small a sample, and I don't account for biases such as that she might not present the material on nights when there are weather extremes which would invalidate randomness and on and on - but still it is remarkable to me that for the three months from early April to late June the range of record highs as captured here is only 12 degrees, from 88 to 100 - as recorded in the years 1941 and 1925 respectively - the earliest date of a record high was 1881 - and that high of 93 was exactly mid-range - global warming indeed......