When are snow and ice most slippery?

Snow and ice are most slippery when the sun comes out and they begin to melt because this process can create a thin layer of water on top of the snow or ice. This layer can act as a lubricant, drastically reducing traction for vehicles and pedestrians. As the temperature rises slightly above freezing, the melting increases the likelihood of slip hazards because individuals may underestimate the danger presented by the moisture.

In contrast, during snowfall, the snow itself may be powdery and less slippery, and while freshly frozen surfaces can also be slick, they do not typically present the same level of slipperiness as melting ice. Early morning conditions can have their own risks, usually related to frost, but not the specific slipperiness associated with melting ice and snow in the presence of sunlight.