CMDL Hourly Surface Observations is historical data set DSI-3274 archived at the National Climatic Data Center (NCDC). Data were provided by the Climate Monitoring and Diagnostics Laboratory (CMDL), which is currently a part of the Office of Oceanic and Atmospheric Research (OAR) of the US National Oceanic and Atmospheric Administration (NOAA). The four observatories that provided data were ... maintained and operated by CMDL in locations where pollution and anthropogenic influences are frequently non-existent. The stations and periods of record were: Point Barrow, Alaska, USA Jan 1976-Jul 1994 Mauna Loa Observatory, Hawaii, USA Jan 1977-Feb 1994 Cape Matutula, American Samoa Jan 1976-Dec 1993 Amundsen-Scott (South Pole), Antarctica Jan 1977-Dec 1993. Major parameters in DSI-3274 include hourly values for air temperature, dew point temperature, precipitation amount, station pressure, vector wind direction, vector wind speed, and wind steadiness factor. (Note: The steadiness factor is 100 times the ratio of the vector wind speed to the average wind speed.) This data set supplements DSI-3273, CMDL Hourly Average Surface Carbon Dioxide, which uses the same 4 sites.