There are other photos of that same sign with correct conversions, so it likely was showing 138ºF (with two broken segments) with a correct conversion to 59ºC.

There are other photos of that same sign with correct conversions, so it likely was showing 138ºF (with two broken segments) with a correct conversion to 59ºC. But it's probably not set up properly to be considered for official record purposes, it's just something for people to stand next to and have their photos taken.