Yep I'd say that's exactly right. You can see that there was pretty decent offshore flow at Astoria mid-month that then relaxed. With the next weak system there on the 25th mixing us out a bit, hence the quick warm-up, before the inversion reformed. Fun to have enough data to be able to recreate the regional weather patterns that far back!

Honestly doubt this “cold wet” pattern holds til the 4th but we will see. Glad to have some rain coming but hopefully no rain on the 4th. It can rain on the 3rd and 5th.

Great stuff! Impressive they pulled off an October shutout, and it looks like the rains didn't really get going that year until December. I'm guessing the abrupt temperature transition on the 21st reflected the relaxing of a persistent weak offshore surface gradient, allowing the inversion to form?

I actually prefer Niños at this point. They tend to frontload each of our seasons a bit, which helps align more with what I'm feeling throughout the year. And in the winter it means our coldest patterns actually align more with our best sun angles. They also have a tendency to reset the intradecadal trends a bit and shake things up for a few more years. Which is sorely needed for us because this last year has been thoroughly putrid weatherwise.

Yeah 2022's torchfest basically ended at about the exact point where legitimately summery conditions become almost impossible in the lowlands due to the beginning of inversion season. Had that pattern gone on even a week or two longer, it probably would have had a much chillier and foggier end. Fall 1993 is a much more recent example, rainy season basically didn't start until Thanksgiving that year but it flipped from warm/dry to cold/dry around the end of October.