Western North Pacific Sea Surface Temperatures (wnpsstnorm) 10-day mean analyzed sea surface temperatures (SSTs) since January 1950 to the latest 10-day for each one degree latitudinal and longitudinal square from 100E to 180E between the equator and 60N. Here, the '10-day' is determined as follows. Three '10-day' analyses are made in each month, and the first 10-day is from the first to the 10th day of the month, the second is from 11th to 20th and the third is from 21st to the last day of the month. The 10-day mean SSTs are analyzed at the Office of Marine Prediction, the JMA, based on in situ SST data compiled by the JMA for a period from 1961 to the latest 10-day. The Compressed Marine Report of the Comprehensive Ocean- Atmosphere Data Set (COADS) compiled by the National Oceanic and Atmospheric Administration of the United States of America are also used in a period from 1946 to 1986. Since 1998, NOAA/AVHRR data have also been used for the region in adjacent to Japan, from 120E to 160E between 20N and 50N. The NOAA/AVHRR data are received and processed at the Meteorological Satellite Center of the JMA. AQUA/AMSR-E have been introduced in the analysis since April 2004, and the coverage of NOAA/AVHRR data were extended to the whole analysis area. AQUA/AMSR-E data are provided by Japan Aerospace Exploration Agency. NOAA/AVHRR Global Area Coverage data are provided by National Oceanic and Atmospheric Administration. Two datasets with different normals are available. "wnpsstnorm 2010"; the normals from 1981 to 2010 "wnpsstnorm 2000"; the normals from 1971 to 2000 Data format The each 10-day mean data set consists of 61 records, one header record and following 60 data records from north to south. The header record contains the year and the serial number of 10-day period in the year, as explained above as yyyy and jj with a FORTRAN format 2I4. Each data record is written as 80I3 from west to east, with unit in 0.1C. That is, the first value of the first data record is for the grid centered at 59.5 degree North and 100.5 degree East, and the last value of the last data record is for that at 0.5 degree North and 179.5 degree East, respectively. '999' and '888' denote the region of land and sea ice, respectively. '777' is placed on the grid where a temperature value cannot be determined. The each monthly normals consists of 2 blocks, each block have the same format with the each block of the 10-day mean data set. Year '9999' in the header record of block shows the block of normal and '8888' shows the block of standard deviation. For further information, please contact the Regional Real Time Data Base at neargoos@climar.kishou.go.jp