How to calculate the weighted average of Relative humidity?

Hi

How to calculate the weighted average of the relative humidity?

attached is my ncl script and here is my PrintVarSummary.

I am getting the min and max of Relative humidity as
min(RH)=-20.4056 max(RH)=213.099.
so I wanted the values are right or wrong.

the data is july 1st 2008 to july 31st 2008

Variable: RH_TL_AVG
Type: float
Total Size: 317440000 bytes
            79360000 values
Number of Dimensions: 4
Dimensions and sizes: [g50_lat_3 | 800] x [g50_lon_4 | 800] x
[initial_time0_hours | 31] x [lv_ISBL1 | 4]
Coordinates:
            initial_time0_hours: [1827654..1828374]
            lv_ISBL1: [700..900]
Number Of Attributes: 10
  center : European Center for Medium-Range Weather Forecasts (RSMC)
  long_name : Relative humidity
  units : %
  _FillValue : 1e+20
  level_indicator : 100
  gds_grid_type : 50
  parameter_table_version : 128
  parameter_number : 157
  forecast_time : 0
  forecast_time_units : hours
(0) min(RH)=-20.4056 max(RH)=213.099
fatal:dim_avg_wgt_n: w must be length nx
fatal:Execute: Error occurred at or near line 17 in file CFRHC.ncl

Can anyone give me some hint to resolve the error?

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