This frightening temperature comes from the Met Office who says: "A dry evening and night, but fog patches are likely to become extensive overnight.
"Light southerly winds, becoming southeasterly at the end of the night.
"Minimum temperature -3 °C."
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A statement from the Department of Infrastructure explains their plan of action this evening and tonight.
They say: "Temperatures are forecast to fall below freezing and there is a risk of ice on roads.
"The Salting of roads on the scheduled network considered to be at risk will be commencing shortly in the Limavady area and will commence / continue throughout Tuesday afternoon and evening elsewhere
"Road users are advised to exercise caution when travelling, particularly when driving on untreated roads."