Unknown temperature

One of the (many many) things the previous owners of the house left behind was this gadget. It used to tell us the outside temperature too, but Hurricane Bawbag put paid to that, it must have given the sensor a right old battering. I have no idea where the sensor is to try and fix it. But will add it to the list of stuff to do. In the meantime, we find out if it is cold by opening the door and sticking our head out.