NASA International Satellite Cloud Climatology Project (ISCCP) C2, 1983-1991

Monthly averages for each 3-hour period during a day, and monthly average for all data Extended to Jun 30, 1991 as of Jul 5, 1995.

News as of August 23, 1993: ISCCP Global Processing Center is changing the algorithm for cloud detecion. The "old" algorithm which was used to generate C1 and C2 products so far will be replaced by the "new" algorithm. The new algorithm will improve the cloud dection in the polar regions. The production of "C" level products of the current and previous months will progress in parallel. It is expected to have 10-year (July 1983 to June 1994) ISCCP C products in Fall 1995. The C1 and C2 products using the "old" algorithm stops at the end of June 1991. Again, if you are interested in areas other than the polar regions (cutoff at about 55 latitude), little change of the cloudiness caused by using the new algorithm is expected.