Parts of Britain have been brought to a standstill as airports and roads are closed due to heavy snow which has claimed another life.
People make their way through snow in Glasgow
A man died trying to clear snow outside his home in Darlington, County Durham - taking the number of recent weather-related deaths to eight.
The areas badly affected by the treacherous conditions are in Scotland.
The latest weather system has been moving south into northern England where it has been weakening.
Edinburgh Airport and Glasgow Airport were both shut due to the freezing conditions. But Glasgow later re-opened.
Dundee, Inverness, Kirkwall and Campbeltown airports in Scotland were also closed. However, it was not only Scottish airports which were disrupted.
Some flights were also cancelled or delayed at Heathrow because of "snow disruption at other airports".
The Met Office has issued severe weather warnings for parts of Scotland and Northern Ireland as well as north east England.
Police in central Scotland said heavy snowfall had led to traffic on many roads across the force being brought to a halt.
Motorways were badly affected, particularly the M80 and M876.
It will be another very cold night with further freezing fog patches across southern Britain.
Sky weather forecaster Isobel Lang
In the Grampian region, the A939 Ballater to Corgarff, the A941 Dufftown to Rhynie, the B974 at Cairn O'Mount and the B976 from Crathie to Gairnshiel roads were shut.
Officers urged motorists to stay at home unless their journey was essential.
Some parts of Northern Ireland and Scotland are expected to see snowfalls of between 5-10cm.
Many schools have sent their pupils home early due to the worsening conditions.
The poor weather has also caused disruption on the railways, with ScotRail warning of delays and cancellations.
The whole of the UK is set to stay around or below zero for much of this week - with south east England at risk of snow showers on Wednesday.
The south west, most of Wales and the Midlands are expected to generally escape the snow.
A woman, with a child in a pushchair, in the Glasgow snow
Meanwhile, central England and areas such as Gloucester and the Cotswolds are likely to see patches of freezing fog lingering all day.
Sky News weather producer Joanna Robinson said: "It will remain very cold this week with the risk of freezing fog, snow and ice.
"Temperatures will struggle to get above freezing for some over the next few days, and overnight they will plummet with a severe frost for many."
She added: "It looks to turn less cold in the west from Thursday, although frosty nights are still expected, perhaps not severe, but the risk of ice will remain.
"Wintry showers will affect eastern counties as far south as Kent on Wednesday, with slight accumulations of snow possible."
On Sunday night, temperatures dropped to minus 17.7C at Topcliffe, near York and forecasters said most places would struggle to reach above zero during the day.
People make their way through snow in Glasgow
A man died trying to clear snow outside his home in Darlington, County Durham - taking the number of recent weather-related deaths to eight.
The areas badly affected by the treacherous conditions are in Scotland.
The latest weather system has been moving south into northern England where it has been weakening.
Edinburgh Airport and Glasgow Airport were both shut due to the freezing conditions. But Glasgow later re-opened.
Dundee, Inverness, Kirkwall and Campbeltown airports in Scotland were also closed. However, it was not only Scottish airports which were disrupted.
Some flights were also cancelled or delayed at Heathrow because of "snow disruption at other airports".
The Met Office has issued severe weather warnings for parts of Scotland and Northern Ireland as well as north east England.
Police in central Scotland said heavy snowfall had led to traffic on many roads across the force being brought to a halt.
Motorways were badly affected, particularly the M80 and M876.
It will be another very cold night with further freezing fog patches across southern Britain.
Sky weather forecaster Isobel Lang
In the Grampian region, the A939 Ballater to Corgarff, the A941 Dufftown to Rhynie, the B974 at Cairn O'Mount and the B976 from Crathie to Gairnshiel roads were shut.
Officers urged motorists to stay at home unless their journey was essential.
Some parts of Northern Ireland and Scotland are expected to see snowfalls of between 5-10cm.
Many schools have sent their pupils home early due to the worsening conditions.
The poor weather has also caused disruption on the railways, with ScotRail warning of delays and cancellations.
The whole of the UK is set to stay around or below zero for much of this week - with south east England at risk of snow showers on Wednesday.
The south west, most of Wales and the Midlands are expected to generally escape the snow.
A woman, with a child in a pushchair, in the Glasgow snow
Meanwhile, central England and areas such as Gloucester and the Cotswolds are likely to see patches of freezing fog lingering all day.
Sky News weather producer Joanna Robinson said: "It will remain very cold this week with the risk of freezing fog, snow and ice.
"Temperatures will struggle to get above freezing for some over the next few days, and overnight they will plummet with a severe frost for many."
She added: "It looks to turn less cold in the west from Thursday, although frosty nights are still expected, perhaps not severe, but the risk of ice will remain.
"Wintry showers will affect eastern counties as far south as Kent on Wednesday, with slight accumulations of snow possible."
On Sunday night, temperatures dropped to minus 17.7C at Topcliffe, near York and forecasters said most places would struggle to reach above zero during the day.