NCDC tells us that Arizona has warmed three degrees since 1950. They accomplished this by adjusting the data upwards and by adding new stations.
The blink comparator above switches between NCDC Arizona temperatures and GHCN HCN Arizona temperatures for all stations which have been active since at least 1920. Note that they cooled 1958 by more than three degrees, and added more than one degree on to 2008.
Very impressive work by the Ministry Of Truth