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.
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