How can I get information about typical sun hours, rain fall and
temperature in a determined date/week/month for any given geographical
location?

Suppose somebody is visiting Lisbon, in Portugal at the second week of
January. What temperature, amount of rain and sunshine he or she can
expect? Mean values for a given week or month would be enough.
I need to get that information in a database for a large number of
geographic areas all over the world (I am using the UN/LOCODE
Subdivision list for every country, available at
http://www.unece.org/cefact/codesfor...des_index.htm).

Thanks very much for your help.
Joel