weather stations may not meet standards of accuracy and
precision of measured data and of spatial and temporal
representativeness (WMO 1981). Development of weather
station networks could partly address these problems, but
would involve high installation and maintenance costs
(Vose and Menne 2004). The Internet has increasingly
been used to disseminate climate and meteorological data,
given its rapid manipulation and display of information,
interaction and feedback with the users, and reduction of
costs. The Internet allows for finding suitable applications
providing free access to meteorological information with
different spatial domains and temporal resolutions. Information
provided by ground weather station data, satellite,
radar, soundings, and weather forecast models can be integrated
to derive a complete description of meteorological
and climatological variables and indices, such as air temperature,
rainfall, North Atlantic Oscillation (NAO) index,
sea surface temperature (SST), and geopotential height