Brian, Is there any way to reliably correct the last 31 days data which appears in the Temp Wind Rain trend charts. This can easily become corrupted, but correcting the 31daysdata.txt file and converting it to the last31daysdata.inf file only partially fixes things.
i would instead edit the log file (this and last months)
then convert those logfiles to data files then use the recreate last 31 days data file function