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.
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
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
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)
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
If you are interested, I can give you a harvester/decoder running in Perl on LINUX/ Postgresql.