historic climate

https://www.researchgate.net/post/Where_is_the_best_website_for_obtaining_historical_climate_data

Would highly recommend Worldclim. I wouldn't go to the trouble of individual weather stations, worldclim already interpolates this data over large areas. You may however wish to check how many weather station are in your region of interest, which may indicate how accurate the data is.

http://www.worldclim.org/. (1970-2000.)

Synthetic WORLD CLIMATE  MAPS OF KÖPPEN-GEIGER since 1900 can be seen and downloaded at

http://koeppen-geiger.vu-wien.ac.at/shifts.htm (1901-2100)

Berkeley Earth has global gridded temperature data: http://berkeleyearth.org/archive/data/ (1750-present)

Also the University of Delaware has gridded land temperature and rainfall from 1950 at half degree resolution: http://climate.geog.udel.edu/~climate/html_pages/archive.html

…