The issue where you see "°F" in the result is due to the degree sign being in UTF-8 while the browser is defaulting to ISO-8859-1.
In your meteobridge template, use ° instead of a literal degree sign, then it should appear correctly irrespective of what the browser's default character set is.
Also, you might try additionally in using dashboard.txt as the result name since it is really just text w/o any HTML markup.