Aggregates like heating, cooling, or growing degree-days are not hardwired into WeeWX. They are actually XType extensions <https://github.com/weewx/weewx/wiki/WeeWX-V4-user-defined-types>. You are free to define your own extension, or even override the existing definitions.
Take a look at class AggregateHeatCool <https://github.com/weewx/weewx/blob/master/bin/weewx/xtypes.py#L484>, and follow the pattern. -tk On Tue, Dec 15, 2020 at 8:13 AM Karen K <[email protected]> wrote: > I found the aggregation type "growing degree day" ("growdeg"). > > There is a special version of that in Europe. In Germany it is called > "Grünlandtemperatursumme". I found no translation to English. The word in > the subject is translated word by word. > > It is based on the daily average temperature, as growing degree day is. > The base temperature is 0 degrees centigrade (32 degrees Fahrenheit). > > - In January, all the values are multiplied by 0.5. > - In February, all the values are multiplied by 0.75. > - Form March on, the values are used as is. > > The sum is calculated from Jan. 1st to May 31st. > > The day, when the value exceeds 200 in spring (if calculated in > centigrade), is considered the start of growing of the plants. > > Some german weather networks ask for those values (sum and date). > > It seems to me that the actual aggregation function does not cover that > version. > > > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/422873ce-dcbd-4e15-9748-573af73f6ccfn%40googlegroups.com > <https://groups.google.com/d/msgid/weewx-user/422873ce-dcbd-4e15-9748-573af73f6ccfn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEA%3DN-bJVwNNaBvtCSt7K-yabEWcp7Yz0-5yOzEc%2BZ2ohw%40mail.gmail.com.
