Average of instantaneous values at 0z, 6z, 12z, and 18z
Average = (00 + 06 + 12 + 18Z)/4
24-hour Instantaneous
The max/min value in a 24 hour period where the period of a day is defined as 0-23:59Z.
Please note: If model time steps are not available, then the instantaneous max/min value can be taken from the output queried over the periods leading to 6z, 12z, 18z, and 24z.
For example, the Tmax value for a day would be the max value identified from the periods -- Tmax(0-5:59Z), Tmax(6-11:59Z), Tmax(12-17:59Z), and Tmax (18-23:59).
Accumulated Every 24-hrs
If model time steps are available, then the value is defined as accumulated over 0-23:59Z via a sum.
If model time steps are not available, then the value should be summed over the available period. For example, sum 0-5:59Z + sum 6-11:59Z + sum 12-17:59z + sum 18z-23:59.
Flux Average 0z-0z
Average of the model time steps over the period defined as 0 - 23:59z. If model time steps are not available, then the average of the average values at model output intervals over the period defined by 0 - 23:59z. For example, [ avg(0-6) + avg(6-12) + avg(12-18) + avg(18-24) ] / 4.