said by gunther_01:
I have heard in the past that as ambient temps drop, devices require more power (current) to operate. I can't recall why, or if it's even true.
It is true. Almost all ICs draw more current (and hence power) as the temperature drops. I wrote about this when people were having issues with some Realtek-based radios during 2006/7 winter.
Anyway IC engineers do what is called "timing analysis" at the required extreme temperatures and make sure that all internal circuits operate correctly. Those extremes are usually -20C/70C for extended ; -40C/85C for industrial and finally -55C/125C for a few miltary and satellite ICs.
The temperature is for the "die" inside the IC which depends on both ambient temperature and thermal specs of the IC packaging.
For occasional WISP radio failures in winter, the main culprits are the oscillator and the CPU. Most of them are tested/rated at -20C and we are actually lucky to have them running below that temperature.