The latest data is provided by the NWS Burlington office. The source data can be found in the Daily Hydrometeorological Report. These plots are updated within the hour of new data being published in the report.
Historical snow depth data was originally pulled from the Ski-VT website
Many thanks to the WCAX engineers who for years reported the snow depth, to Ski-VT for reporting the historical data, and to the NWS for stepping in to keep the historical record going.