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Forecasters have warned that more heavy snow is on the way - as soon as Tuesday.
There may be a foot of snow on higher ground in parts of Wales that day, with lighter but still significant falls in areas of central England.
Paul Knightley, a forecaster with MeteoGroup, the weather division of the Press Association, said a system moving in from the Atlantic on Monday evening would meet colder air, forming snow.
"Across higher ground in central and south Wales, we can expect to see heavy snow - 20 to 30cm, or up to a foot, by Tuesday lunchtime, with strong winds pushing it higher in drifts.
"Tuesday is going to be a nasty day across much of Wales.
"We can also expect to see falls of 5cm to 10cm in parts of the Midlands. We are not sure how far north or how far south this snow could fall. Southern counties may have some snow on Tuesday morning, but not enough to settle."
He warned drivers to be on their guard against the new falls. "It's quite a big snowfall, probably the biggest fall of this cold spell, in Wales," he said. "It's particularly badly timed because people will going back to work after the weekend break.
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"There could be problems anywhere in Wales, or large parts of central and southern England, in the next 48 to 72 hours - people should check forecasts before going out."
Forecasters have already warned that there will be freezing weather for the New Year.
Temperatures are expected to plunge to minus 3C in most of England and Wales on Thursday night, New Year's Eve, and minus 8C in Scotland, with widespread snow showers also predicted.
