Not sure if what I have will help you, but I will give you what I have...
ASME Boiler and Pressure Vessel Code.
Section VIII, Subsection B Letter designation UW (Unfired pressure vessels fabricated by welding)
UW-30 "It is recommended that no welding of any kind be done when the temperature of the base metal is lower than 0 degrees F (-20 degrees C). At temperatures between 32 degrees F (0 degrees C) and 0 degrees F (-20 degrees C) the surface of all areas within 75mm (3") of the point where a weld is to be started should be heated to a temperature at least warm to the hand.... before welding is started. It is recommended also that no welding be done when surfaces are wet or covered with ice, when snow is falling on the surfaces to be welded, or during periods of high wind, unless the welder or welding operators and the work are properly protected. (UW-30)
Hope that is of some use.
Should give you a place to start anyway.