Russ Steele
On our way to Utah from Idaho we stopped in Ketchum to have dinner with a writing friend, who offered to promote my book Cobalt: Legacy of the Blackbird Mine. Kathy ran a book store in Stanley for many years, and until she retired recently worked in a Ketchum book store. She knows how to sell books. While in Ketchum we visited the Ranger Station which hosts one of the USNCN stations. It looks like Ketchum has a cooling trend until the late 1980s, about the time the Ketchum and Sun Valley experienced rapid growth. Here the 1930s was not the warmest, but the 1990s, until about 2003 and then it starts cooling.
Note the aspens in front of the shelter, blocking access to the door. Temperature plot below.
On the other hand there has been very little growth in Jerome a farming community directly south of Ketchum on SR-93. We stopped to visit the USHCN station in the maintenance yard of the Northside Canal Company on the edge of town. It also showed some warming starting in the 1980s, but the 1930s are still the warmest period in Jerome. Go figure.
You can find all the photos of both sites here, click on Idaho. Temperature Plot below