Sometimes, weather conditions are unpredictable on Kilimanjaro. There might be unseasonably heavy snowfall at the time of your visit. While this makes for a picturesque and whitely approach to the top-most point of Africa, it also means slippery trail, which might make your summit day hectic. While it is not necessary to bring crampons, especially if you are visiting around the dry season, having them as a backup is a good idea.