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@Gordon
Interesting question :)
I just checked and the STM32s themselves will handle -40°C to 105°C. The voltage regulator on the Pico will do up to 125°C, but the voltage regulator on the original board tops out at 85°C.
It looks like the resonator and the FET on the Pico are good for 125°C and 150°C respectively, so unless the passives have problems (which I doubt) I think the Pico is fine for Industrial temperature range.