image captionSnow on the M4 Junction 24 Coldra East (Westbound) near Newport
Four vaccination centres have been shut as Wales awoke to snow.
Appointments at the Bridgend, Rhondda, Abercynon and Merthyr Tydfil centres for Sunday will be rescheduled for safety reasons, the Cwm Taf Morgannwg health board said.
Forecasters have issued a yellow weather warning that runs from 03:00 to 21:00 on Sunday for all of Wales apart from Anglesey.
Police have warned of difficult conditions due to snow and ice.
Up to 3cm of snow is forecast to fall in most areas, with 10 to 15cm expected in the Brecon Beacons and Snowdonia.
The health board urged anyone with queries about Sunday’s vaccination appointments to call the number on their appointment letters.
North Wales Police tweeted that there was “widespread snow this morning, particularly in some higher areas, making driving conditions difficult.
Traffic Wales’ CCTV cameras show snow across the roads network.
And Dyfed-Powys Police said some roads were “impassable” and advised people to “stay home”.
image captionMotorists faced tricky conditions on the roads in Wrexham
image captionThere was also a covering of snow on the roads in Llanfor in Gwynedd
The drop in temperatures is likely to exacerbate problems after widespread flooding caused by Storm Christoph.
North Wales Police warned of difficult conditions due “widespread snow”, particularly on high ground.
It said the A499 near Pwllheli had received heavy snowfall overnight.
image captionThere was a good covering of snow in Swansea on Sunday morning…
image caption… and this is a view in Pontypridd, Rhondda Cynon Taff
image captionNick Rolfe shared this garden view in Nercwys, near Mold, Flintshire
The Met Office warned travellers that “longer journey times by road, bus and train services” could be expected, although Wales is in a level four lockdown with all but essential travel banned.
It also said the snow could lead to power cuts and other services, such as mobile phone coverage, may be affected.
Those going out for daily exercise have been warned there could be icy patches on some untreated roads, pavements and cycle paths.
image captionIn Powys, this was the view over Newtown on Sunday
image captionThe hills around Llangollen, Denbighshire, were covered in snow on Saturday
image captionPower cuts and travel delays are possible, the Met Office says
Meanwhile, two flood warnings issued by Natural Resources Wales remain in place, meaning flooding is expected.
These cover the River Ritec at Tenby in Pembrokeshire, which could affect the Kiln Park caravan site, and the community of Bangor on Dee in Wrexham, where 30 people were forced to leave their homes when Storm Christoph struck.
image captionPretty as a picture… Suzy shares this garden view in Snowdonia
image captionSun up: Heath in Cardiff awakes to a covering of snow
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