This example represents a 6hour maximum of a field valid on 20120103 00Z produced by a reforecast started on 20120101 00Z with the model version which is operational at 20130101 00Z . In this example, the maximum is the 6hourly maximum in the time interval: steps 42 to 48.
 In bold, the values are fixed. They are meant to be used by all partners
 In green, these are the values for the example.
Time (Maximum over the last 6 hours )  

Start of reforecast ( section 1 )  
Octets  Fixed  Meaning of values  Grib_api keys  
12  Significance of Reference Time  1  Start of forecast  
1314  Year (four digits)  2012  year of start of forecast 
dataDate=20120101 dataTime=0

15  Month  01  month of start of forecast  
16  Day  01  day of start of forecast  
17  Hour  00  hour of start of forecast  
Maximum ( section 4 e.g. template 4.61)  
18  Indicator of unit of time range  1  Hour  
1922  Forecast time  42  Step at the beginning of the 6hourly interval  startStep=42 
3839  Year of Model Version  2013 
When the forecast is run == when the version of the forecast used was operational  modelVersionDate=20130101 modelVersionTime=0

40  Month of Model Version  01  
41  Day of Model Version  01  
42  Hour of Model Version  00  
43  Minute of Model Version  00  
44  Second of Model Version  00  
4546  year of end of overall time interval  2012 
End of maximum period  endStep=48 
47  month of end of overall time interval  01  
48  day of end of overall time interval  03  
49  hour of end of overall time interval  00  
52  number of time ranges  1  Only one time statistics applied (maximum)  
5356  total number of data values missing in statistical process  0  
57  Statistical process used to calculate the processed field from the field at each time increment during the time range  2  Maximum  stepType=max 
58  Type of time increment between successive fields used in the statistical processing  2  Successive times processed have same start time of forecast, forecast time is incremented  
59  Indicator of unit of time for time range over which statistical processing is done  1  Hour  indicatorOfUnitForTimeRange=1 
6063  Length of the time range over which statistical processing is done, in units defined by the previous octet  6  6hourly maximum  lengthOfTimeRange=6 
64  Indicator of unit of time for the increment between the successive fields used  1  Hour  indicatorOfUnitForTimeIncrement=1 
6568  Time increment between successive fields, in units defined by the previous octet  0  Maximum computed continuously in the 6 hourly interval  timeIncrement=0 
Examples of grib2 headers: