So the temp raised 1.98 degrees in Maine but no where else? Like water rising in one area and not the rest of the world?
Not possible in either case.
You are correct, but what the original author probably does not understand is that the "average" temperature doesn't tell you much if you are looking at differences of only a degree or two. Temperatures vary over short distances in Maine (and many other places) depending on things like shade from trees, elevation, proximity to water, slope, local air flow patterns, etc.
It is entirely possible to see 2 degree differences just walking around to different places on a farm. And you can get 3 degree warmer daytime average daytime high temperature in June just by driving from Machias to Amherst.
I'm no blueberry expert but I suspect the wild blueberries of Maine are not affected by the climate differences between Amherst Maine and Machias Maine.