This has happened a few times, and not just on my computer, or my copy of it: The temperature is messed up, with -99999 being actually 99999 and visa versa.
@webb Well, the lowest temperature is -273.15C and the console uses kelvins so the minimum temperature is 0K. Trying to do a '-' in the console with temperature probably won't work because of the fact that no temperatures go below 0K.