Its cold out there! Don't worry your electric fence should be working fine. Here are a few things to remember:
1. If you have deep snow, it will short out the fence.
2. If you have ice build up on the wire, that can short out your fence too if its around the insulators.
Sometimes, there is not much you can do for your fence in the cold with deep snow, but remember to keep your livestock fed and they should be happy to stay where they are...
Your battery or solar fence chargers can be turned off, to keep them from discharging.. wait till the snow is down and clear before turning them back on.
Have a great winter!!!