I have bookmarks somewhere, but I’m on mobile right now. Here’s some saved from the old BOX site with 1961-1990 normals. Click annual averages https://web.archive.org/web/20000815054151/http://www.nws.noaa.gov/er/box/
I’m not saying it isn’t off…it appears to be a good +2F to me. But the problem is apparently more than just a faulty sensor.
The good ol’ days weren’t always good either.