Contact NCDC's Climate Services Branch for further information. NCDC has numerous datasets and data inventories on-line through its web system. NCDC makes frequent updates to this system, so users are encouraged to review it periodically to see what's available. Includes 3 datasets - TD3505, TD3280, and TD9956. See documentation for further details.
Elements vary considerably by station.
Occasionally, if needed observations are not found in TD1129 or TD1171, we use TD9956 as a source. About 1000 stations currently active. Generally 1946 to present. Undergoes automated and manual quality control. Generally 1948 to present.