I’ve been to several Coyotes games, it’s never full and often times more fans of opposing teams than Coyotes fans.
I’ve been to several diamondbacks games. Usually less than 1/3 filled and when a team like the Cubs or Dodgers or Red Sox comes to town it’s overwhelmingly fans of the opposing team.
Cardinals are usually full and are more Cardinals fans now but 4 years ago I saw the Broncos there and it was easily 60/40 Broncos/Cardinals fans. Last game I saw was against the Rams and it was about 70/30 Cards/Rams.
Suns are packed now, but before their run to the Finals last year the last game I saw before the shut down was 60% full and about 40% Toronto Raptors fans vs Suns.
Phoenix is definitely a fair weather sports city.