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How was that chart made? Is it showing records that were records at the time? Or records that are still standing? IMO the best way to do it is to look at it is records that are still standing. If you look at records that were records at the time, then there will be increasingly few of those (assuming an unchanging climate).
Also, was the number of stations in operation roughly the same throughout that period?
Around here, the occurrence of daily high records does seem to be greater in recent decades, although mainly in fall/winter/spring, not in summer, and overall records are not really increasing - cold records occur less frequently, so the temperatures are not getting more extreme, just warmer.
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