As noted in the section on record breaking days, the dominant Summer records are still held by years prior to 1950. Here is the breakdown of which years still hold records.
As you can see, other than 1889 and 2012, which we will look at in detail, there number of record days still held in various years is fairly flat. That is, recent decades do not have a disproportional number of record breaking days.
This is graph below shows the seasonal breakdown of those same years.
Record breaking days of the Recent Warm Period dominate the Winter and Fall months. Those years in the 1900-1939 years dominate the Summer months, with the Recent Warm Period a blip of just 11 days total.