Google says this about the Flagstaff AZ area...
"Located in the high country mountains of northern Arizona, Flagstaff is not the Arizona experience you may expect. At 7,000 feet elevation, temperatures rarely exceed 90 degrees in the summer, fall brings a brilliant change of color, winter snowfall averages 108 inches and spring bursts with blossoms."
Truck it with caution during the winter months... This is a great time to have a CB radio and listen to what the truck drivers are dealing with in this area. You hear the phrase "Lets go ice skating alot on Ch 19"
Then you have to deal with windy mountain passes on I17 heading down into the Phoenix area...
Just keep being aware of the conditions...
Roy Ken