I believe the estimated rise is for global mean temperatures but the linked article is discussing a local peak temperature, which aren't really comparable units.
This fundamental misunderstanding is likely what prevents people from really understanding the impact of global warming. After all, a 2.5° difference is well within the daily temperature variance or every region of the US. It takes a decent understanding of statistics to understand that an 5% increase in an average translates to a very large increase in the frequency of rare events at the extreme.
I.e., a 1 inch increase in average human height translates into something like a 10-100x increase in the number of people over 7ft tall, yet a set of brothers may vary in height by much more than an inch.
Fort Yukon, Alaska is 6 miles above the Arctic Circle and is often above 80 degrees F from June - August.
The Yukon Flats National Wildlife Refuge experiences extreme temperature variance and scarce precipitation. Fort Yukon holds the state record high temperature of 100° F (38° C), and comes close to the record low at –75° F (-59° C).
Yukon Flats is the only place in the world where temperatures of 100° F have been recorded north of the Arctic Circle. The Refuge also experiences some of the coldest temperatures of any inhabited area. In the uplands and mountains surrounding the Yukon Flats, there is less temperature variance with cooler summers and warmer winters.
"forecasts a temperature rise of 2.5 to 10 degrees Fahrenheit over the next century." [1].
I might be wrong but I feel like the temperatures are getting higher quicker than we think.
[1]: https://climate.nasa.gov/effects/