Lake Chelan is 50.5 miles (81.3 km) long lake that is located deep in the cascades mountains, which makes it technically a fjord. In the south you have Chelan, WA and the in the north there is Stehekin, WA
https://en.wikipedia.org/wiki/Lake_Chelan#Climate
Even though Stehekin, WA is deep in the mountains it has almost exactly the same temperature as Chelan, WA thanks to the low elevation (since they are on the same coast they have the same elevation) and the lake probably moderates the climate a bit as well. the only difference is the precipitation.
I'm going to guess most people are going to pick Chelan and then the few snow lovers on here will pick Stehekin, but I still think it's an interesting comparison.
Just to give you an idea of their locations and how far in the mountains Lake Chelan goes.
https://www.google.com/maps/@48.0830.../data=!3m1!1e3
Also rate the cities.
For me personally I prefer Chelan and I rate it as a B+ and Stehekin I rate it as a C