Yes, the quantity near the high end is itself reaching record levels, but if we're talking about the highest temps we achieve each winter, that's pretty stable, no? So you could have let's say 8-9 60 degree highs now vs maybe 4-5 decades ago? But the top end high temps are around the same? Maybe there's a ceiling for the extreme temps and they very rarely get beyond a certain number-- for the winter I'd estimate that to be 70. We very rarely get temps AOB 70 and that hasn't changed since record keeping started. It would be interesting to bracket the frequency of high end temps....so let's say how many 60+ highs vs an earlier period, how many 65+ highs vs back then, how many 68+ (20C+) highs vs back then, 70+ etc. The higher up you go, the less the differences I would imagine, as we get closer to the ceiling.
We're getting closer to a Denver type climate, I just wish the humidity would get as low as it is there. I love warm days and cool nights...we have some of that in Fall (November), but in Denver that's a common pattern.