September 2025 came in as the 7th consecutive +AO month. The odds of having 7-consecutive months of either direction are 1/64.. so once in 5 years. It shows that we are in a decadal +AO phase, which I believe really took a step up after the Solar Flares in May 2024. However, since 2012, the Summer AO sign as been flipping for the Winter in most cases, favoring a ridge at 90N. I wouldn't be surprised to see this 90N ridge again this Winter, but the Polar/Mid-latitude Cell puts a corresponding trough at 45N (not 40N), which may be further north than you might expect for -AO.