The cameras have performed well at temperatures into the low teens and single digits. But, during my use of them, they haven't been challenged by temperatures that low. My guess is that there would be no problem, but that's just a guess.
If you mean run the signal through the computer, yes. But ,you have to use the monitor as the receiver then use the USB cable to divert the signal to the computer. Please ensure that you have downloaded the uniden software to allow it to play