Almost. "trend_dict" is undefined.
So, I looked thru the weewx codebase and found this bit of code in
cheetahgenerator.py that I inserted prior to the "all_stats =
TimespanBinder(timespan)" line in xstats.py:
try:
trend_dict = self.generator.skin_dict['Units']['Trend']
except KeyError:
trend_dict = {'time_delta' : 10800,
'time_grace' : 300}
Now, $seven_day.heatdeg.sum works!
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