R. 70 and 80 will be difficult, Weather/ Preciptation data only:
There first address for preciptation data is European Centre for Medium-Range Weather Forecasts in Reading.
http://www.ecmwf.int/
There are bunch of data products mostly free for download. Look for the data center, reanalysis projects adressing the 60s and 80s.
There is a project called GHCN Global Historical Climatology Network at NOAA and alot of world wide preciptation products are available there
http://www.ncdc.noaa.gov/data-access/land-based-station-data/land-based-datasets/global-historical-climatology-network-ghcn
There is an other database at NOAA called GCPC
Version 2.2 Combined Precipitation Data Set 2.5x2.5 degrees resolution
but from 1979 till 2013 I' think monthly means
http://www.esrl.noaa.gov/psd/data/gridded/data.gpcp.html
From the Swedish Baltic NEST Institute you can get runoff and weather data - a surroagte called BED - Baltic Environmental Database (the runoff basin of the baltic sea covers "the half" of europe)
http://nest.su.se/bed/
The spanish provider ogimet.com has a hourly database of synop/metar weather telegrams from europe (or the world?) from the 2000 (synop) till now, with a very dense station net ( boys, stations, ships, oil/heli platforms, airports) ..but very heterogenous ..alot of work
http://www.ogimet.com/synops.phtml.en
If you are interested, I can give you a harvester/decoder running in Perl on LINUX/ Postgresql.