Acetlylene tank at near-freezing temps

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Am I imagining this, or is it the case: My O/A equipment is in an unheated space behind my shop, and I'm up in Canada and it's getting wintery again.  It seems to me that, with larger welding tips (delivering more gas) I can more readily get the working pressure I need with the acetylene when the temperature of the workspace has been warmer - say 40-80 degrees Farenheit - than when the temperature is around freezing (or below).I've tried to reason this through.  I've got an almost completely full bottle of acetylene.  And a bottle in an unheated space must get to pretty near the ambient temperature of my workspace.  So I'm wondering if the acetone in the bottle yields acetylene at a somewhat lower rate if the bottle temperature is cold. ??
Reply:Search... search... search... Do a search, a LOT has been written about this. An Acetylene tank looses approx. 2# per degree below 70 degrees, this is not written in stone it's just a rule of thumb.Just my  opinion, not from a book, just from the road.Howes Welding Inc.www.howesweldinginc.com
Reply:They run out sooner in Winter, have less of a fill in the Winter, and just plain ol' fizzle.But come Summer, it's like the never ending bottle"Any day above ground is a good day"http://www.farmersamm.com/