[gpm]

That's just the device temperature right? If it's operating device temperature and not device storage temperature I think it's fine.

-4f (-20c) is cold, the cabin of the car is heated to well above that. Just heat the lidar as well.

[apacala]

That's operating temp without external heater. Storage temp is lower.

Even automotive cameras have built in heaters to allow them to operate lower than -20C. Nothing preventing adding the same functionality to our sensors.