filename (str) – filepath or url to read for the fixed-width file.
data (Dataframe) – A dataframe with DatetimeIndex and all of the variables in the file.
CRN files contain 5 minute averages labeled by the interval ending time. Here, missing data is flagged as NaN, rather than the lowest possible integer for a field (e.g. -999 or -99). Air temperature in deg C. Wind speed in m/s at a height of 1.5 m above ground level.
Variables corresponding to standard pvlib variables are renamed, e.g. SOLAR_RADIATION becomes ghi. See the pvlib.iotools.crn.VARIABLE_MAP dict for the complete mapping.