The data used on WorldClimate comes from numerous public
domain sources. The sources are acknowledged here, with
links to sites where you can download the original data (where
available - most of the links have died since this was first written in
Worldclimate.com has processed the data from each of these
sources to make it easy to use.
Most of the source data
consists of LARGE (up to 70MB) compressed text files, designed for
academic researchers. Worldclimate
CANNOT help you with understanding or using this data. Be
prepared to spend a considerable amount of time
and effort downloading and converting the data.
GHCN version 1 was released in August of 1992 and has data from
~6,000 Temperature stations
~7,500 Precipitation stations
~2,000 Pressure stations
The earliest station data is from 1697. The most recent from 1990. It was
created from 15 source data sets, including:
NCDC's World Weather Records
CAC's Climate Anomaly Monitoring System (CAMS)
NCAR's World Monthly Surface Station Climatology
CIRES' (Eischeid/Diaz) Global precipitation data set
P. Jones' Temperature data base for the world
S. Nicholson's African precipitation data base, etc.
Quality Control included visual inspection of graphs of all station time series, tests for precipitation digitized 6 months out of phase, tests for different stations having identical data, and other tests.