It follows a six-year November low being recorded last night of -9.8C at Loch Glascarnoch beside the Garve-Ullapool road.
It was also -6.6C at Aberdeen Airport.
Met Office figures, published by the BBC, showed expected lows tonight included -9C in Aviemore, -5C in Glasgow, -4C in Livingston and Jedburgh and -2C in Edinburgh.
However, milder conditions are expected to follow tomorrow night.
Forecaster Mark Vogan said the Loch Glascarnoch reading was the UK's lowest recorded in November since 2010.