Originally Posted by
GFrye
"The greatest amount of snow ever recorded at the official reporting station in Phoenix was 1.0 inch on January 20 1933, and on January 21 and 22 1937." -
Weather Facts - Snow in the Phoenix Metropolitan Area
My post was a general additional reason why a flight would be "closed" while the aircraft remains at the gate for a while, not meant to be specifically for PHX.
Probably not a lot of de-icing done at Sky Harbor in 1933 or 1937.