Ummm I did do it right.
It's a welding shop with about 20-25 welding machines going at once. WE have a thermometer in each corner of the shop.
I used my cell to get it converted. and this site:
http://www.albireo.ch/temperatureconverter/
http://www.onlineconversion.com/temperature.htm
http://www.wbuf.noaa.gov/tempfc.htm
and finally
http://geography.about.com/c/ht/00/0...0962932698.htm
The old school way of doing it.