DWD online stations:
Stations with hourly resolution
filename convention
rr1_YYMMDD
ascii format with 5 columns: 1) time (YYMMDDHH), 2) station number, 3) latitude, 4) longitude, 5) hourly rain rate in 1/10mm
time is in UTC
hourly value is from hh:51 bis hh:50
Stations with 1 minute resolution
filename convention
mr_YYMMDD
binary format according to
beschreibung_mr_90.pdf
time is in MEZ
a Fortran program to read the data is available on request