A Met office weather warning for snow has been extended to include Exeter and the rest of Devon.
A yellow weather warning of snow has been issued for the region on Thursday. It is valid from 10am on Thursday until 9pm.
The Exeter based office said rain moving eastwards across the south of the UK on Thursday may turn to snow in places.
Adding that there is a small chance of snow settling with disruption to road, rail and air services as well as interruptions to power supplies and other utilities.
A chief forecaster added: "If the area of heavy rain moves further north, this would pull cold air into the system and bring snow to parts of southern England and south Wales. At the same time heavy rain will likely persist in some areas along with the potential for some locally strong winds."
Snow is most likely on higher ground, such as on Dartmoor and Exeter.
The cold weather will continue into the weekend, with snow forecast for Saturday night into Sunday morning in Exeter.
Friday will be the coldest day of winter so far and the Arctic blast will start to hit the UK on Wednesday.
The Met Office has warned it will bring with it snowstorms and chilly winds which will reach the whole of the UK by the weekend, and from Friday, the whole of the country could see freezing storms bring two to four inches (5 to 10cm) of snow as temperatures dip "well below" freezing.
Temperatures could drop as low as minus two degrees Celsius - 28 Fahrenheit on Friday night but daytime temperatures not much higher - but the Arctic blast will make it feel a lot colder.
Video: Snow in Exeter