Per PAweather it is the first time he sees the PAweather 540 line coming out of the arctic circle.
Per Blizz it is Sept 1 but any snow that falls in Aug is counted.
Voyager thinks it is fall and winter 365 days a year.
Itstrainingtime thinks the first time he slouches into his chair for a game from Actuary field it is now fall.
Canderson thinks it is colder in July than December these days so fall may start in May?