There's indeed a case to back you up: >Air-launched weapons like cruise missiles must endure hours of sub-freezing temperatures at high altitudes while riding

There's indeed a case to back you up: >Air-launched weapons like cruise missiles must endure hours of sub-freezing temperatures at high altitudes while riding their carrier aircraft. Weaponeers successfully subjected the W-80’s components – including the IHE – to temperatures down to -65 Fahrenheit – during development. >But when actually tested in Shot Baseball during Operation Guardian in January 1981, the W-80 fizzled. The new nuke failed to ignite its fusion secondary and produced only a fraction of its intended yield. The IHE proved to be the culprit. It didn’t burn well at very low temperatures. http://warisboring.com/articles/america-had-a-problem-with-its-nuclear-warheads-freezing/ http://warisboring.com/articles/america-had-a-problem-with-i...