Having had a swag that has been covered in snow overnight (and also lived in areas that regularly receive snow) - the key will be to get the stuff off asap as its the weight that will be the killer!
Not much has been done in Australia on snow loads, but overseas, fresh snow (not old, waterlogged compacted snow) weights vary from between 200 and 300kg per cubic metre. Waterlogged or compacted snow, perhaps doulbe or triple that! So a 10 cm depth over a square metre will weigh between 20 and 30kg, probably the upper figure given that we dont often get truly "dry" snow.
We have a bit of land up at Tolmie, just outside Mansfield, with a house at 900m. Many years ago, we received a snowfall of 60cm overnight. All was well, the place looked a picture.
The next night, it rained. Half of the roof trusses in the house broke, they were ok with the fresh snow, but didnt like the extra wet load .
So, if it snows, light a flaming big fire in the middle of the tent. This will keep the roof warm and melt the snow!!
Seriously, some form of additional heat source inside the CT will help to melt the snow as it lands on the roof. If you have it, keep some form of gas heater going inside, but keep the doors and windows open and dont go to sleep - have a snowball fight to keep awake.
Use a gennie and an electric blow heater and keep it blasting away inside to keep the ambient temp up as high as possible.