You should be able to use our tents in most weather conditions. But remember it is a tent, not a cabin. Although it is designed to withstand harsh weather conditions, it is not indestructible.
It will withstand strong winds and heavy rain but do not leave the tent unattended during snowfall. Especially wet and heavy snow will put a forceful load on your tent. The snow must be regularly brushed off the flysheet or it will ultimately perhaps destroy the tent. The weight of the snow can reach as much as 400 grams per liter of snow, which means that as little as two inches of snow on the surface will measure about 20 kilos per square meter. The tent surface on for example the Lavvo 6 is about 14 square meters where the flysheet would be exposed to about 280 kilograms of pressure. Depending on the circumstances the pole or fabric will eventually break if the snow is allowed to accumulate on the tent. Snow at -3 degrees celsius weighs about 50 gram per liter. Two inches of snow equals 2.5 kilograms per square meter which adds up to 35 kilosgrams of pressure on the flysheet. With a constant force stretching/ pushing the fabric over several days will stretch the nylon fabric in such a way that it will finally break. Or the pull will gradually wear down the pole/ poles. Take strong wind into the equation and the situation will deteriorate even faster. So. Brush the snow off the tent once in a while. Do this and the tent will be a reliable shelter in most extreme weather conditions.