IMAGES of cars driving in the snow near the Lecht Ski Centre in the Cairngorms National Park come after northern and eastern parts of Scotland experienced sub-zero temperatures on both Friday and Saturday evening.
Temperatures are set to plunge again midway through this week, with sleet and snow already falling in some areas.
The Met Office said a brief return to slightly milder conditions would make way for a widespread chilly spell, with figures potentially falling as low as -8C.
Greg Dewhurst, meteorologist at the Met Office, said: “Overall, (it is) generally a cold week to come ... a short, less cold spell, before frost and fog are the main features initially.
“Then (there is) potential for some rain and some hill snow as we move through the latter part of Wednesday into Thursday.”
An area of low pressure moving in from the south west on Thursday could meet colder air and create rain across southern England and Wales which could turn to snow over higher ground.
Wintry showers have been seen in Scotland providing hill snow, with temperatures below average. Scotland could see temperatures dip as low as -3C over the week.
England, Wales and Northern Ireland will be quite cloudy with outbreaks of rain on Monday morning, before an area of low pressure pulls south eastwards towards the continent to create brighter spells.
Figures will peak in double figures in southern England and Wales on Monday but will begin to slide heading into Tuesday, which will be largely dry with some early fog and sunny spells.
It will be a widely frosty evening on Tuesday night, with temperatures generally around -2C to -5C and possibly as low as -8C in the far north of England and Scotland.
The coldest recorded temperature so far this autumn was -7.7C in Shap, Cumbria, in the early hours of Saturday morning.