A weather warning remains in place.
Earlier this month experts from the Woodland Trust also revealed that snow brought on by the original Beast from the East hit many early-blooming flowers.
Met Office meteorologist Alex Burkhill said: "It will be bitterly cold with some snow for many places over the weekend".
Charlotte Armitage, citizen science officer for the Woodland Trust, told the Metro: 'When we get prolonged mild periods as we have done recently, plants and wildlife are fooled into thinking the seasons are changing and start to become more active.
BBC Weather presenter Ben Rich said a more persistent area of snow began to develop over south-eastern areas and the Midlands on Saturday afternoon and is starting to drift further west.
The white stuff continued to fall this morning, and large swathes of the country were expected to see more of it as the day progressed.
"It will stay windy, and it will stay very cold indeed".
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Sunday is also likely to see further snow, especially for parts of the South West, where as much as 25cm could fall on higher ground. Winds easing slowly. Maximum temperature 1 °C.
Meteorologist Martin Bowles said the weekend's weather could be dubbed a "mini beast from the east", though it wouldn't bring anything like the same impact.
All Flybe-operated flights departing from Exeter Airport were cancelled on Sunday, while snow also caused the temporary closure of Bristol airport.
"Our teams will be working throughout the night to keep our runways and taxiways operational and we will be closely monitoring the weather forecasts with our on-site Met Office".
Gatwick said passengers should check the status of their flights and also allow extra time for their journey to the airport.
Richard Leonard, head of road safety at Highways England, said: "Gritters will be out treating our roads around the clock, but it is still important to drive to the conditions when snow is forecast".
"Make sure you keep your distance and reduce your speed if you need to travel because, even in conditions that seem normal and when the snow is not settling, it can be slippery if ice patches have formed, or where fresh salt has not been worked into the carriageway".