Grist's new piece takes stock of the summer that just ended, concluding that the season really was as hot as it seemed. The article points to hard numbers rather than anecdote, and those numbers are striking.
The piece quotes an expert who says the figures are simply astonishing. That reaction underscores the scale of what many people felt on a daily basis.
Because there is only one source here, there is no disagreement to note. The analysis stands on its own: this summer's heat was extreme and measurable, matching the public's memory of it.