The icy conditions are causing problems across parts of the country, with the Met Office issuing a 'be aware"'warning for Flintshire, Denbighshire, Conwy and Wrexham.
There are problems on some roads in Denbighshire and Powys. South Wales Police urge caution in Rhondda Cynon Taff and Merthyr.
Icy by night, chilly by day - brace yourself for a cold week ahead.
High pressure keeps the weather chilly by day, icy by night, with an increasing risk of freezing fog.
High pressure this weeks means mainly cold bright days and icy cold nights.