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== It's January 1st and my 'rain since midnight' and/or 'last 24 hours rain' are wrong/negative ==
You are probably using a Davis station. Cumulus needs an incrementing rain counter to calculate all of the rain figures, and the nearest to that on a Davis station is the annual total. When this resets at the end of the year, this causes some of the rain data to show odd values for a day.
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