My first thought was Dream Theater. It feels like they've had a ton of releases come out in the Fall, and I associate them with the weather cooling off.
A quick check on wiki confirms this..
I&W...even though this was released in July, I saw them on their first tour leg in October, and then again in December.
Awake....Released October 4, 1994
FII...released September 23, 1997
SFAM...released October 26, 1999
Train Of Thought...released November 11, 2003
ADTOE...September 13, 2011
DT12...Released September 23, 2013
AVFTTOTW...released October 22, 2021
Heck, even their live albums are predominantly released in the Fall...
Live At The Marquee...released September 1993
Once In A Livetime...released October 27, 1998
LSFNY....orig September 11, 2001
Live At Budokan...released October 5, 2004
Score...released August 29, 2006
Chaos In Motion...released September 30, 2008
Live At Luna Park...released November 5th, 2013
BTFW...released September 29, 2014
Distant memories...released Novemver 27, 2020