We have been to the Great Wall of China 2 years ago. It was the end of January when we went there so it was freezing cold. Fortunately, there was not much wind so I was able to withstand the freezing weather. There were some piles of snow in the pathway of the Great Wall but it was not slippery. After walking for about half a kilometer, we went back to the starting point. It was tiring but it's worth it. I would suggest a trip to the Great Wall during summer so the weather would be warm.