Hazardous driving conditions are expected on Monday following sub-zero temperatures The big freeze continues in Wales with bitterly cold temperatures overnight and fresh warnings of ice on roads.
The Met Office said wintry showers falling on roads in sub-zero temperatures could lead to ice on untreated surfaces.
Police in north Wales are warning people to take precautions if going out in cold weather following an unexplained death on Anglesey.
Several school closures have been announced for Monday.
Some flights into Cardiff Airport were also delayed because of the weather.
A spokeswoman for the airport said in-bound flights from Newcastle, Glasgow and Edinburgh were affected due to de-icing issues.
Police are investigating after a woman’s body was found outside in Gwalchmai, Anglesey over the weekend. Police say they are treating the death as unexplained.
Over the weekend, an ice climber suffered serious back injuries after a 60ft (18m) fall from a frozen waterfall in the Brecon Beacons.
The climber, from Cardiff, lost his footing when the ice beneath his feet gave way.
On Monday morning, road conditions were once again treacherous after temperatures as low as -8C (18F) or -9C (16F) were reported in Wales.
Freezing temperatures meant concern over ice, particularly on untreated roads, and there was also fog reported in parts of north-east Wales.
First Cymru said there were some disruptions to services because of conditions. In Bridgend county, service 30 is unable to serve Caerau Parc; Further west, service 129 is unable to operate via Penygarn; while services 400/404 are unable to operate via Penyrheol.
There were also school closures confirmed in several counties including Powys, Rhondda Cynon Taf, Wrexham and Caerphilly county.
Sunny spells are expected on Monday but there are warnings of freezing fog.
BBC Wales weather presenter Sue Charles said: “The snow began to thaw over the weekend but after another bitter night, things are about to get colder again, with ice and fog patches a problem on Monday morning.
“So it starts frosty – ice on untreated surfaces, freezing fog patches, especially along the Marches – but through the afternoon most of us should see some sunshine although temperatures will struggle to get above freezing nearer the border.
“Where we’ve got onshore wind, it might be more like 2 or 3C, such as Anglesey and Gwynedd.
“Overnight into Tuesday, there will be a widespread frost and further snow – it’s more likely across parts of north and mid Wales and it’s hard to say exactly how far south it will come. It will be colder than Monday.
“So raw northerly winds keeping temperatures down and brighter and breezy on Wednesday. There are signs that things will turn slightly less cold by the end of the week.”
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