Outside Temperature gauge

Hi All after the recent cold weather my outside teperature moinitor appears to be stuck at -9'c is there anyway to rester the monitor ?
 

Mine stops working when in low range. Which is irritating because then the aircon stops working properly and I have to override it manually.

They never used to be on older vehicles an item that could be reset as such. They have been a Thermistor (resistance that varies with temp), much the same as the engine temperature sensor.
They are usually located about the grille area, if you can find it warm it up and see it the reading changes. If it stays put it's likely it's failed, simple to replace and even easier if you still have a warranty.
Of course this assume Suzuki have not reinvented the wheel and given you a resettable digital temperature sensor that's just tripped!