> In theory, there is no difference between theory and practice.

Isn't there a Line2 to that ?

"In practice, there is"

In theory that is, practically speaking

As for the LM317, I'd agree with John Coppens. Yours will fall
outside of Milspec, but could possibly be close to it. The same
way that PICs are sorted. You might find a -04 that works up to
almost, or even at, 20MHz - although "works" is a word to be
careful with

Regardless, easy enough to heat the 317. As in other threads
about low-temperature circuits or those prone to condensation,
a warming resistor would do it

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