I must assume you are correct about the Canadian conversion to Celsius, but Hawley Lake is in the White Mountain, far northeastern Arizona. It probably doesn't have many year-round residents as it is between 9000 and 10,000 feet in elevation. Been near it but not to it.

Place like Bullhead City and Boulder Dam are low desert can be 50 degress at night and 80 degrees in the afternoon in February.

BTW, it was always supposed to be called Hoover Dam but FDR showed his subtantial nasty streak and changed it to Boulder Dam to dis his predecessor.