Final answer:
Snow can remain on mountain slopes even when temperatures are higher than freezing due to factors such as elevation, slope aspect, and shading.
Step-by-step explanation:
Snow can remain on mountain slopes even when daytime temperatures are higher than the freezing temperature due to a combination of factors such as elevation, slope aspect, and shading. When sunlight hits a slope, the angle of the slope can affect how much sunlight is absorbed or reflected. South-facing slopes receive more direct sunlight and warmth, which can melt snow faster. Conversely, north-facing slopes receive less direct sunlight and can stay colder, allowing snow to remain for longer periods.