WINTRY weather is expected to hit Cornwall this week, with plunging temperatures and frosty mornings.
The forecast has led public health bosses to urge residents to keep an eye on elderly and vulnerable neighbours who suffer most during the cold weather.
Mark Wilson, a Met Office meteorologist, said winter had set in for the foreseeable future.
He said: "This week looks likely to see temperatures falling closer to the early December average across the south of England.
"This means that by day, temperatures will be around 9 Celsius, with some nights seeing temperatures falling close to or below freezing, particularly in more rural areas.
"As we look ahead to the rest of December, a return to the unseasonably mild conditions of recent times is not currently expected."
After a maximum temperature today of 8c, there will be freezing conditions overnight with lows of -1c possible.
Tomorrow, variable amounts of cloud will be thickest in the east of the county.
It will be largely dry with some bright spells, though perhaps the odd drizzly outbreak over hills and a maximum temperature of 7c.
It is estimated that every year an average of around 25,000 extra people die in England over the winter period and many of these deaths are preventable according to experts.
Professor Debra Lapthorne, Centre Director for the Devon, Cornwall and Somerset Public Health England, said there was real danger for certain groups of people as temperatures fell.
"Cold weather can lead to serious health problems, such as heart attacks and strokes, and can make chest diseases worse," she said.
The impact of cold weather is felt most by older people, the very young and those who have pre-existing health conditions, said Professor Lapthorne, adding leaflets were available containing practical advice on how to cope.
"Much of our advice on protecting health indoors is common sense," she said.
"People should eat warm food and drink hot drinks, heat homes to at least 18C and move about to keep warm."
She said they were also urging everyone to consider those who may be affected by the cold – such as an elderly relative, friend or neighbour, or someone in poor health.
Professor Keith Willett, NHS England's clinical director for acute care, said a pharmacy was a good first port of call if people were suffering coughs, colds and sneezes.
"As a doctor who has spent some 30 years working in A&E, every winter, doctors and nurses see a big increase in the number of people, particularly older and frail people, who are admitted to hospital because of respiratory or other chronic conditions usually worsened by immobility, the cold and viral illnesses."