Arrived around 4:15pm. Had a 175 mile drive from the Phoenix Airport.
Bad experience with Hertz. First car was dirty and had not been serviced. Second car'a/c did not work. Third car was OK.
Very hot and dry. It was 111F when we arrived in Phoenix. It is 6pm in Williams and it it 83F, humidity is 10%.
Williams is at elevation 7200ft. Not much vegetation driving north from Phoenix unroll you are 40 miles south of Flagstaff. Probably more moisture.