Hi,
One approach for a simple calculation like this could be to use the
StdCalibrate service to set extraTemp1. In weewx.conf something like(untested):
[StdCalibrate]
[[Corrections]]
extraTemp1 = inTemp - outTemp
This will not be overwritten during upgrade and should achieve the same result.
One thing to be aware of when using temperature differences is that weewx unit
conversion will not work on a temperature difference. For example, if the
driver for your station emits F and your database uses US units, but you try to
display extraTemp1 in C it will be wrong. If you only display F you will be
fine.
Gary
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