The enhanced warm season warming relative to the cool season in the PNW was a consequence of intradecadal variability related to changes in the IPWP structure and associated seasonality of ITCZ structure there.
That mode of variability has begun to rapidly quasi-invert since 2024. Going forward (on an intradecadal timescale) it is likely that warming in the PNW will be focused during the cold season with summers probably not changing much or even cooling slightly relative to the post-2013 averages.
In essence the overall amplitude of the seasonal cycle in the PNW will generally flatten over the coming decade with fewer seasonal extremes. Which I assume is probably better for the regional biosphere.