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Hi and welcome to the forums
You'll need to replace the outside temperature sensor. Its located on the underside of one of the wing mirrors. Look for a little bump on one of them.
You will need to take the back off the wing mirror to get at the sensor and its wiring.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo