Snow-covered sheep huddle together on the moors near Castleton, Yorkshire. Photograph: Ian Forsyth/Getty Images
Ice, snow and rain will plague the country as communities in the south-west continue to tackle flooding.
The Met Office says Hampshire, Dorset and Somerset remain at medium risk of flooding as another day or rain hits the counties.
Meanwhile, snow will fall across high ground throughout the UK on Monday, particularly across Wales, Scotland and northern England, with some hailstorms and thunder predicted.
Temperatures will fall to around freezing, resulting in a risk of icy stretches on roads and the potential for travel disruption, the Met Office adds.
The Environment Agency has issued more than 140 flood alerts and 10 more serious flood warnings in the south-west; a serious warning means flooding is expected and immediate action is required.
Somerset county council has declared a "major incident" as large parts of the county remain under water.
The environment secretary Owen Paterson is expected to visit the region to hold crisis talks with farmers and the local council, the Western Morning News reports.
On Sunday, farmers held a demonstration against the Environment Agency, which it accuses of failing to dredge the rivers.
Council leaders, the emergency services and government agencies who make up the Local Resilience forum on flooding met on Sunday night to discuss the crisis.
The group confirmed that people at risk of flooding had been visited over the weekend by either the emergency services, local authorities or local utility companies.
Avon and Somerset police launched a police boat to reach flooded homes in Mulcheney, on the Somerset Levels.
The team gave fire prevention and health and safety advice to residents affected by the floods.
Many communities still coming to terms with the flooding, which hit Somerset at the beginning of January, now face further problems.
Somerset county council's deputy chief executive, Pat Flaherty, said: "Our priority has to be to keep people safe.
"We are doing everything we can to do this, and we believe that declaring a major incident shows just how urgent the situation is for many of our residents and communities.
"The reason we are taking this action is the long-term nature of the issues we are facing and to enable a consistent approach to the way that we deal with them."
A Tory MP criticised the Environment Agency, claiming the "out-of-control" quango's decision not to dredge rivers on the Somerset Levels regularly had exacerbated the problems.
The Bridgwater and West Somerset MP, Ian Liddell-Grainger, told BBC Radio 4's Today programme: "Once it is dredged, we can then maintain it, but the Environment Agency has to stop this mucking around and get on with it."
He dismissed as "pathetic" the Environment Agency's claims that the rain would have overwhelmed the river system even if it had dredged the waterways.
"It is an absolutely ridiculous excuse," he said. "This never flooded to this level ever in living memory, and we've got people who have been here for a long time. If you look back into the mists of time you don't have this.
"What galls my constituents … is, they found £31m to build a bird sanctuary at the mouth of the Parrett river, yet they cannot and will not find £5m to dredge this river.