Code Figure  Meaning 

0 
Average 
1 
Accumulation (see Note 1) 
2 
Maximum 
3 
Minimum 
4 
Difference (value at the end of
the time range minus value at the beginning) 
5 
Root Mean Square 
6 
Standard Deviation 
7 
Covariance (temporal variance) (see Note 2) 
8 
Difference ( value at the
beginning of the time range minus value at the end) 
9 
Ratio (see Note 3) 
10  Standardized Anomaly 
11 
Summation 
12 
Return period 
13 
Median 
1499  Reserved 
100 
Severity 
101 
Mode 
102 
Index processing (see Note 4) 
103191  Reserved 
192254 
Reserved for Local Use 
192  Climatological Mean Value: multiple year averages of
quantities which are themselves means over some period of time (P2)
less than a year. The reference time (R) indicates the date and time of
the start of a period of time, given by R to R + P2, over which a mean
is formed; N indicates the number of such periodmeans that are
averaged together to form the climatological value, assuming that the N
periodmean fields are separated by one year. The reference time
indicates the start of the Nyear climatology. N is given in octets
2223 of the PDS. If P1 = 0 then the data averaged in the basic interval P2 are assumed to be continuous, i.e., all available data are simply averaged together. If P1 = 1 (the units of time  octet 18, code table 4  are not relevant here) then the data averaged together in the basic interval P2 are valid only at the time (hour, minute) given in the reference time, for all the days included in the P2 period. The units of P2 are given by the contents of octet 18 and Table 4. 
193  Average of N forecasts (or initialized analyses); each product has forecast period of P1 (P1=0 for initialized analyses); products have reference times at intervals of P2, beginning at the given reference time. 
194  Average of N uninitialized analyses, starting at reference time, at intervals of P2. 
Average of forecast accumulations. P1 = start of accumulation period. P2 = end of accumulation period. Reference time is the start time of the first forecast, other forecasts at 24hour intervals. Number in Ave = number of forecasts used.  

Average of successive forecast accumulations. P1 = start of accumulation period. P2 = end of accumulation period. Reference time is the start time of the first forecast, other forecasts at (P2  P1) intervals. Number in Ave = number of forecasts used 
Average of forecast averages. P1 = start of averaging period. P2 = end of averaging period. Reference time is the start time of the first forecast, other forecasts at 24hour intervals. Number in Ave = number of forecast used  
Average of successive forecast averages. P1 = start of averaging period. P2 = end of averaging period. Reference time is the start time of the first forecast, other forecasts at (P2  P1) intervals. Number in Ave = number of forecasts used  
199 
Climatological Average of N analyses, each a year apart, starting from initial time R and for the period from R+P1 to R+P2. 
200 
Climatological Average of N forecasts, each a year apart, starting from initial time R and for the period from R+P1 to R+P2. 
201 
Climatological Root Mean Square difference between N forecasts and their verifying analyses, each a year apart, starting with initial time R and for the period from R+P1 to R+P2. 
202 
Climatological Standard Deviation of N forecasts from the mean of the same N forecasts, for forecasts one year apart. The first forecast starts wtih initial time R and is for the period from R+P1 to R+P2. 
203 
Climatological Standard Deviation of N analyses from the mean of the same N analyses, for analyses one year apart. The first analyses is valid for period R+P1 to R+P2. 
Average of forecast accumulations. P1 = start of accumulation period. P2 = end of accumulation period. Reference time is the start time of the first forecast, other forecasts at 6hour intervals. Number in Ave = number of forecast used  
Average of forecast averages. P1 = start of averaging period. P2 = end of averaging period. Reference time is the start time of the first forecast, other forecasts at 6hour intervals. Number in Ave = number of forecast used  
Average of forecast accumulations. P1 = start of accumulation period. P2 = end of accumulation period. Reference time is the start time of the first forecast, other forecasts at 12hour intervals. Number in Ave = number of forecast used  
Average of forecast averages. P1 = start of averaging period. P2 = end of averaging period. Reference time is the start time of the first forecast, other forecasts at 12hour intervals. Number in Ave = number of forecast used  
208  Variance 
209  Coefficient 
255  Missing 
Notes: (1) The original data value (Y in the note 4 of regulation 92.9.4) has units of Code table 4.2 multiplied by second, unless otherwise noted on Code table 4.2. (2) The original data value has squared units of Code table 4.2. (3) The original data value is nondimensional number without units. (4) For code number 102 the drought index encoded in the message is specified by the table entries from discipline 0 and parameter category 22 with the corresponding parameter number. The statistical processing period of the drought index is defined by the keys "length of time range" and "indicator of unit of time for the increment" 