Query: When was the greatest snowfall?
Context: Freezing rain and sleet also occur most winters, and occasionally the area experiences a major damaging ice storm. On January 24–25, 2000, Raleigh received its greatest snowfall from a single storm – 20.3 inches (52 cm) – the Winter Storm of January 2000. Storms of this magnitude are generally the result of cold air damming that affects the city due to its proximity to the Appalachian Mountains.