Artificial grass can cope with the general cold weather experienced in the UK, it won’t die with a change in temperature and it will stay green all the way through until spring. If it is particularly rainy, artificial lawns can actually drain water better than a natural lawn, with a stable layer of aggregates present underneath a weed membrane.
If there is light snow then we recommend you let it melt naturally, or clear it by hand if it needs to be moved. Though artificial lawns are made of tough stuff, it might not be a good idea to take a hard shovel to it.
On the rare occasion that we experience a particularly cold snap and there is compacted snow or ice the best thing to do is, again, to let it melt naturally. If the ground becomes frozen and the individual blades of grass go hard and icy than it can be uncomfortable to walk on. If you try to remove the ice the grass can become damaged. It is possible to salt the area but this is not recommended as the it can affect the drainage of your lawn.
If you know there is going to be heavy snow in the future, you could put down a waterproof sheet like tarpaulin to protect your lawn as a preventative measure.