Cumulus Support

My site is showing
Highest Hourly Rainfall 542.4 mm 1:03 AM on 20 June

There was no rain on this day - any assistance greatly appreciated

Look in alltimelog.txt for the entry for the bogus record, to find the 'old' record.

Use the all-time record editor on the edit menu to reinstate the old record.

Consider setting 'spike removal' values for hourly rain (and rain rate) on the calibration screen, so Cumulus can try to filter out any future aberrant behaviour by your station.