Very warm days percent wrt 90th percentile of reference period
ecatx90p.RdLet infile1 be a time series of the daily maximum temperature TX, and infile2 be the 90th percentile TXn90 of daily maximum temperatures for any period used as reference. Then the percentage of time where TX > TXn90. is calculated. TXn90 is calculated as the 90th percentile of daily maximum temperatures of a five day window centred on each calendar day of a given climate reference period. Note that both TX and TXn90 have to be given in the same units. The date information of a timestep in outfile is the date of the last contributing timestep in infile1.