Installing parts in sub-freezing temps?

[WrangledMyselfIntoThisOne]

Discomfort for the installer aside (I'll deal with it, or at least try), are there any known cons to bolting down parts in sub-freezing temps? I know most car garages are heated, as is the factory, and most people installing things themselves do it in their own garage which is somewhat warmer than the outdoors. However I unfortunately don't have access to a garage, but I have some day 1 installs I'd like to do, specifically a steel bumper. I was hoping my Jeep would arrive this week when temps were in the 50s, but it looks like temps are going back to the low-30s for the next couple weeks at the very least.

Any downsides to torquing down bumper-to-frame bolts in sub-freezing temps aside from things hurting more if I hit my hand on something? I guess my thought goes to bolts being a bit more brittle in those temps, and also things expanding more when temps get warmer again from the torque-down point at ~25F vs .~70F. Am I overthinking things in the process of counting down the days until my Jeep finally gets built and delivered or is this something to be concerned about?

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[GtX]

You're over thinking it.