I data are delivered in three months lot about six weeks after the end of each quarter. A processing program is now being modified for this purpose. Reasons for this difference are under investigation. GPCC is not able to distribute station-related observational data to others in order to respect the interests of the data suppliers. The grid size is both 2.5 by 2.5 and 1 by 1 degree geographical latitude by longitude.
All data used are quality-controlled on high level with automatic plus visual checks.
New gridded data sets were created during 4th quarter of 1998 for the months August and September 1998. The database is presented in Tables 2 and 3. NASA DAAC has published a CD ROM containing GPCC's land surface monthly precipitation for the period January 1986 to December 1997. 2.4.2.2 Extended Database Product Status as before. The mirror is updated once per month so far.