In most cases I am sure it is obvious. If there is 0 F outside, snow, dark, icy sidewalks and you are going outside acting like it is summer and you fall down

In most cases I am sure it is obvious. If there is 0 F outside, snow, dark, icy sidewalks and you are going outside acting like it is summer and you fall down it is your own fault and nobody except you is liable for that. I think we agree here. I can only talk about the German court system in detail but usually cases where somebody breaks his arm because of an icy sidewalk do not even end up in a court room. For a sidewalk to be icy it has to be cold. If you are going outside, it is cold and your are acting like it is summer (even without snow, it being dark, ...) you are the one who fell and nobody is liable for that. It is common knowledge that you should be careful. This is at least how it works in Germany and in many countries in Europe.