`  ==50 °F = 30 °C==  While my correction of ``50 °F (10 °C)`` to ``50 °F (30 °C)`` is correct because it is a ``temperature variance``—an interval, a difference between two readings—rather than a temperature reading, the original unsourced addition of that ``temperature variences of 50 degress`` number may be questionable.  It would probably make sense as being not uncommon, but OTOH it probably isn't what you'd expect on an average day.  It was added by  15 Dec 2005 10:43 UTC (if I've done the conversion to UTC correctly), and the next day edited by the same  to ``temperature variances of 50°F (10°C)`` adding the incorrect conversion (as well as fixing one misspelling and replacing the other with symbols) on 16 Dec 2005 10:46 UTC.    The fact that MONGO's source was a worse speller than MONGO doesn't give me much confidence in the reliability of that number.  Maybe it should just be removed.  Then if someone wants to find something along those lines that can be verified in a reliable source, okay.   `