The worst of the snow may be over for most but warnings remain in place.
Map shows the areas affected for the next two days.
Much more detail and background at the BBC Weather site.
Prestwick Airport expects to have helped over 3,000 passengers diverted from other airports because of snow.
One flight diverted from Glasgow International was a long-haul service from Dubai.
Operations director Jules Matteoni said: “We are one of the few airports in the UK to have remained open during this exceptional period of adverse weather.
“Our location means that we have an excellent weather record and we play an important role whenever other airports are closed.
"We also have extensive infrastructure to accommodate diverted aircraft and their passengers as well as a robust strategy for remaining operational."
Stories have continued to emerge of dedicated NHS staff and care workers who have struggled through the snow to get to work.
Support worker Georgina Smillie, walked through the snow in Castlemilk to her work assisting learning disabled people in the community.
"It took me about an hour to get in," she said.
"It was a struggle to get here, trying to walk in the snow, but I made sure I got here to support these guys."
"These people need help with cooking, with their medication, their housework and getting out to their activities."
Dr Andrew Murray, NHS medical director at Forth Valley, told BBC Scotland that there had been a "huge effort" from individuals and teams to ensure staff got to their work.
Beds were moved into outpatient wards so that staff were able to stay overnight.
He said: "Our portering and catering staff have really been pulling out all the stops. Some of them have been staying in for a couple of nights at a time.
"We've got to keep people fed, keep the show on the road and keep the lights on."
West Lothian Council is planning to re-open secondary schools on Monday.
The following schools are planned to open at normal opening times.
A spokesman said: "All council primary schools, nurseries and special schools will remain closed on Monday.
"We will aim to get these schools open as quickly as possible and parents will receive an update on these schools on Monday.
ScotRail Alliance managing director Alex Hynes has been talking about progress on re-starting rail services.
He said: "The worst of the weather is over and our task is now to reopen Scotland's railway network.
"We're working night and day now, line by line, to inspect each line of route to make sure it's safe to run.
"So we're introducing a limited service on many lines of route.
"We're expanding the hours of operation and over the course of the coming hours and days we'll be opening more and more of Scotland's railway network."
Over 100 flights have flown at Edinburgh Airport on Friday, with the last scheduled departure set for 20:50. Arrivals will continue until later into the evening.
A spokesman said: Edinburgh Airport aims to open on Saturday for business as usual. We are waiting for our airline partners to confirm their schedules.
"It is important that passengers check with their airline regarding their flight details before travelling to the airport on Saturday."
Teams have been working to clear the snow. The airport is operational again but a large number of flights still delayed and cancelled.
All weekend Scottish Professional Football League fixtures have been called off because of the weather.
Nine games went off on Thursday and Friday's postponement of Alloa v East Fife in League One means all Saturday's Scottish league games are off.
Ross County v Partick Thistle, Inverness V Brechin, Arbroath v Ayr, Forfar v Raith Rovers and Montrose v Annan were called off on Friday.
The four Scottish Cup quarter-finals could still go ahead.
Road closures and access issues as a result of the bad weather have been causing problems for dairy and livestock farmers across Scotland.
NFU Scotland President Andrew McCornick said: “The immediate impact of this is that many dairy farmers are not getting their milk collected and are being forced to dispose of it in their slurry after a days’ milking.
"We are hopeful that collections for these farms will return to normal at the weekend but with the weather being so unpredictable it is hard to say."
He added: “The bad weather being experienced across the country is further proof of what a difficult but vital job our farmers, crofters and growers do, as they continue to brave the arctic conditions to keep Scotland’s food chains running and shop shelves stocked."
More than half the personnel have been down manned from an offshore platform in the Moray Firth due to water supply problems caused by frozen pipes.
Wood - which operates Beatrice Alpha for Repsol Sinopec - said a total 24 non-essential personnel had left the platform due to an "issue with water supply".
An essential crew of 22 remained.
A Wood spokesman said: "Measures are in place to ensure they have an ample water supply."
Police have appealed for information to help trace a woman reported missing in the Ochil Hills.
Alison Fox, 51, from Alloa, went walking in the hills behind Menstrie on Thursday but got lost.
Mountain rescue teams and local officers have been searching but so far she has not been located.
Insp Jim Young said: "I must stress that I do not want members of the public to come out and assist with the search due to the weather conditions but if you have any relevant information that can help us establish Alison's whereabouts please contact the police immediately. "
Alison is described as being white, 5ft 2ins tall with a slim build, short red hair, freckles across her face and thick glasses. She speaks with an English accent and is a keen runner and hillwalker.
Flights have resumed at Edinburgh Airport.
In a statement, the airport operator said: "We have flown 31% of our schedule today. We are currently scheduled to have departures up to 20:50 tonight.
"Our expectation is that airlines will run full schedule tomorrow and we continue to work hard to make that possible. We will be snow clearing throughout.
"We remind passengers that both easyJet and Ryanair have cancelled operations for today."
Megan Appleton says she is really grateful for the work farmers near her home, to the north of Dundee, are doing to try to keep roads open.
She said they have been battling "fierce drifting".
Rail workers have been checking and clearing lines in Scotland.
NetworkRail Scotland said entering the Bishopton tunnel on the line to Inverclyde was like "entering another world".
The local community in a remote village, cut off by wintry conditions, has worked together to help a pregnant woman who went into labour.
Roads were blocked to Balgedie near Kinross. Nearby off-duty midwives offered to help and were assisted to the scene by local farmers, after an alert was sent out on social media.
Emma Niven whose husband Rob was one of the first to get involved with his tractor spoke to the John Beattie radio programme.
She said: "It's just been the most magical morning. An emergency message went out on Facebook looking for midwives for our neighbour who was in the late stages of labour and was stuck.
"We just couldn't get her out and nobody could get to her so we got the tractors out and negotiated a couple of midwives and brought them to her just in time at a critical stage where the baby's head was actually stuck.
"So all has turned out well but oh my goodness what a morning."
In a post on Facebook, the new mum said: "Wow! I am absolutely blown away by you all! What an incredible community we live in!!! Baby boy is here safe and sound after a terrifying home birth which was only possible thanks to you all!
"Thank you to our amazing neighbours, friends, midwives, ambulance and police services who walked, dug and ploughed their way to us!! And my clever sister for posting on here! Baby and I are now safely on our way to hospital! Pics, name & weight to follow. Thank you all x x x"
Sean took this picture at Callands near West Linton in the Scottish Borders.
He said the drifts have closed off the roads to and from this small community.
Flybe has cancelled Friday's flights out of London City Airport, including links with Edinburgh and Aberdeen.
The airline says other flights in and out of Edinburgh and Glasgow continue to face disruption, and booked passengers should check before going to their departure airport. It has cancelled all aircraft movements today at Cardiff and Dublin.
The latest recordings show depths of 50cm in Drumalbin near Lanark in South Lanarkshire - although elsewhere depths could be even higher.
Power company SP Energy Networks has been providing 4x4 vehicles to ferry NHS staff to their work in central and southern Scotland.
Among them was A&E medic Dr John Mackay, who was taken from his home in Livingston to his night shift at the Forth Valley Hospital in Larbert by SP Energy Networks worker Scott Morrice.
Engineer Jim Kennedy picked up midwives Frances and Jackie and ferried them to the Pitteuchar Medical Centre in Glenrothes so that they could attend vital clinics.
Guy Jefferson, SP Energy Networks customer services director, said: "Our staff realise the gravity of the situation and the real difficulty some of our colleagues in the NHS have experienced over the last 72 hours in getting to and from their work.
"We have a fleet of 4x4 vehicles and engineers who are able to deal with driving in adverse conditions, and we are happy to help communities wherever we can."
He said the heavy snow had so far not brought any major disruption to the electricity network.
"Our network in Central Scotland is holding up well despite the heavy snowfall we've seen over past 72 hours. Currently we're operating at 'business as usual' levels, but we will continue to monitor any change in conditions."
ScotRail say they have teams hard at work trying to clear tracks and get services moving again.
The Edinburgh bus driver who skillfully swerved to avoid a car in the treacherous weather conditions on Wednesday has been speaking to the BBC.
Charmaine Laurie told the Victoria Derbyshire programme she didn't have much time to react but managed to steer clear of a Mini which had skidded on the ice.
She said: "I just tapped the brake but my back end started to slide out so I had to take my foot off the brake and just try and glide it through the space that was there."
There were about 20 passengers on the bus at the time, including children.
Footage of the incident was filmed on a dashcam by van driver Gareth Smith.
Ms Laurie added: "A lot of it was just instinct but we are trained to be aware of these kind of situations.
Asked how passengers reacted, she said: "No-one really said anything afterwards.
"But one lady getting off the bus asked me how I was and said 'well done'."
Clear up operations continue across the country as public transport slowly starts to get back in action.
BBC Scotland's Richard Gordon sent in this image of a stop in the Borders and the challenge it will present to get on board any bus.
A yellow weather warning for snow and ice on Sunday into Monday has spread out its reach.
Earlier forecasts had it confined to more northern and eastern parts but the Met Office has now extended it further south and west.
Remember, too, there is still an earlier warning in place until Saturday night for snow in many parts.
There are reports of people struggling to get the essentials like milk and bread as the weather hampers deliveries.
Pictures have been posted on social media showing empty supermarket and shop shelves.
One local shop owner in Glasgow has been telling BBC Radio Scotland's John Beattie programme: "We've had no deliveries at all for the last two days. No papers as well.
"Everyone's been looking for the milk and bread."
A Tesco delivery driver told the same programme supplies were now beginning to get through.
"The main roads are clear," he said.
"We are getting in to most of the stores now and they are replenishing their shelves."
Will we ever see a pavement ever again? The snow in Edinburgh is more than ankle deep.
Highland Council says the A835 Ullapool-Ledmore junction remains closed due to fresh snowfalls and drifting.
Extra staff are being sent to the area to help the local roads squad to clear the route as far as possible in the conditions they are facing.
Also in Wester Ross, the C1047 Drumrunie-Achiltibuie is closed and the A832 Gairloch-Dundonell road is affected by drifting snow, particularly at Mungasdale.
Highland Council said travel in parts of Easter Ross has also been challenging, and gritters have been targeting priority routes in the area.