Octobers with < 2” of rain in Olympia: 2006, 2002, 1993, 1987, 1983, 1980, 1978, 1974, 1972, 1964, 1952.
Useless. Good winters in 06/07, 83/84, 78/79, 72/73. Bad winters in 02/03, 87/88, 80/81, 74/75. Haven’t looked at 93/94, 64/65, 52/53. But there is no predictive value regardless.
That’s because the PDO covaries w/ ENSO/IPWP on a lag.
If you calculate years where PDO/ENSO are out of phase during boreal autumn (e.g. 2023/24(-/+), 2016/17(+/-) 2012/13(-/+), 2009/10(-/+), 1995/96(+/-), 1983/84(+/-), etc, the correlation to both 500mb patterns and temps/precip over the lower-48 vanishes completely.