We could put the weight and temperature in the infobox input as a plain metric number with no formatting (i.e. no °C or kg after the number) and then format the number in the infobox. (See http://thelongdark.wikia.com/wiki/Template:Velonews/Sandbox) This way we can do a unit conversion to include imperial units. This prevents us from needing to maintain numbers in two different units and will allow for more formatting options that can be applied quickly to every item.