Didn't know that but no surprise, Flagstaff being at 7000 feet elevation same as Grand Canyon south rim, typically losing 5 degrees F temp per 1000 feet of elevation, so Phoenix in the 90s is Flagstaff and GC south in the 60s, and 90s at the bottom of the canyon. But also greatly reduced snow in the northern states. The traditional ice skating race on frozen Dutch canals has only been held 3 times in the last 50 years, last in 1997, and since then held on a frozen lake in Austria, due to effects of climate change in the Netherlands.