I want to calculate growing degree days.
I have hourly data of temperature between the hours of 00:00 and 23:59.
I want to calculate the growing degree days and I saw that I need the minimum,maximum and mean temperatures. However, I don't know if I should filter my data to contain temperature data only for the daylight time or to use the whole day temperature.
What is the right data to use for the GDD calcualtion?