Overnight temperatures fell as low as minus 14C in Altanharra, northern Scotland, according to the Met Office.
The cold snap gripping the UK is predicted to continue with Friday night set to be the chilliest night of the winter.
Looking ahead to Friday, a further yellow warning for ice comes into effect at 03:00 until 11:00 covering areas in south west ...
Find out which are shut in your local authority amid heavy snow and ice weather warnings - Overnight on Wednesday, ...