The change seems obvious if you’ve lived every year in the Pacific Northwest. Front Ranger has lived in Denver for a while, right? That might be the source of the disconnect. There are certain things that these statistics don’t perfectly capture—sunshine hours, rainy days as opposed to amount of rain, cloud cover, etc.
A fairly sizable increase there as well. May 2022 and May 2024 are the only post-2013 years that came in at or below the historical average there in that metric.
I don't know why this would be a revelation to someone who supposedly follows our weather, either. The warming in May is not something that is exclusive to PDX.