Tuning How cold is too cold to tune a PCP air rifle?

Too many variables and value judgments at play here for me to assert anything definitive. The degree to which any given gun responds to temperature changes is all over the spectrum. I’ll just say if I have a new gun that I want to play with and it happens to be 30F outside, you’ll find me in the carport shooting out across the property, and you’ll see a chronograph and some hand tools nearby.
 
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I've been doing it in spite of the temps from under my covered porch, I was just wondering if I was just wasting time and pellets. I figured I may have to tweak it later, but at least it's a starting point.
I would be doing the same thing, shooting and adjusting.

Time to adjust your settings in spring, if you notice a difference.