GSOD - "Global Sumary of the Day"
This executable processes  Integrated Surface Data" (ISD) producing a processed daily summary for all the stations submitted as
an input file.

main1.f   -  "main" executive which when compiled will be renamed to isd_gsod.exe
Supporting fortran functions:  dat3.com addsec.f daily.f mansec.f precip_value.f sums1.f write1.f ww_value.f

To complile:  make -f  isd_to_gsod.mk<enter>  (which creates executable "isd_gsod.exe")

Usage:  isd_gsod.exe  input_isd_file_name   output_filename<enter>    (both arguments are required)

Sample output:
STN--- WBAN   YEARMODA    TEMP       DEWP      SLP        STP       VISIB      WDSP     MXSPD   GUST    MAX     MIN   PRCP   SNDP   FRSHTT
007026 99999  20140711    78.8  4    57.2  4  9999.9  0  9999.9  0  999.9  0    4.0  4    9.9   17.1    84.2*   71.6*  0.00I 999.9  000000
007026 99999  20140712    68.8 14    58.5 14  9999.9  0  9999.9  0  999.9  0    1.8 14    5.1  999.9    75.2*   62.6*  0.00I 999.9  000000
008403 99999  20140101    85.8 24    54.4 24  1010.3 23  9999.9  0    6.2 24    0.5 24    1.9  999.9   102.7*   69.3*  0.00I 999.9  000000
008403 99999  20140102    86.3 24    54.1 24  1010.4 24  9999.9  0    6.2 24    0.4 24    1.9  999.9   102.9*   71.1*  0.00I 999.9  000000
008403 99999  20140103    85.9 24    54.6 24  1011.2 24  9999.9  0    6.2 24    0.5 24    1.0  999.9   101.1*   72.0*  0.00I 999.9  000000
008403 99999  20140104    85.6 24    49.7 24  1011.2 24  9999.9  0    6.1 24    0.5 24    1.0  999.9   102.7*   70.5*  0.00I 999.9  000000
008403 99999  20140105    84.8 23    52.1 23  1010.1 23  9999.9  0    6.2 23    0.5 23    1.9  999.9   102.0*   66.6*  0.00I 999.9  000000
008403 99999  20140106    86.8 23    56.1 23  1008.5 22  9999.9  0    6.2 23    0.7 23    2.9  999.9   102.0*   70.9*  0.00I 999.9  000000
008403 99999  20140107    87.7 24    56.4 24  1007.8 23  9999.9  0    6.1 24    0.8 24    2.9  999.9   103.6*   73.6*  0.00I 999.9  000000
...
...
...
998499 99999  20140904    76.0 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    9.2 24   15.0  999.9    84.4*   70.3*  0.00I 999.9  000000
998499 99999  20140905    79.7 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    8.8 24   15.9  999.9    87.4*   72.3*  0.00I 999.9  000000
998499 99999  20140906    65.9 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    7.6 24   13.0  999.9    70.9*   62.4*  0.00I 999.9  000000
998499 99999  20140907    67.3 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    4.9 24    8.9  999.9    72.5*   62.1*  0.00I 999.9  000000
998499 99999  20140908    68.0 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    4.1 24    8.0  999.9    72.5*   63.5*  0.00I 999.9  000000
998499 99999  20140909    69.9 20  9999.9  0  9999.9  0  9999.9  0  999.9  0    5.1 20    8.9  999.9    77.2*   66.0*  0.00I 999.9  000000
998499 99999  20140910    72.4 24  9999.9  0  9999.9  0  9999.9  0  999.9  0   10.7 24   17.1  999.9    79.5*   65.1*  0.00I 999.9  000000
998499 99999  20140911    55.3 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    9.0 24   15.0  999.9    74.7*   50.5*  0.00I 999.9  000000
998499 99999  20140912    53.7 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    9.8 24   15.0  999.9    55.9*   49.8*  0.00I 999.9  000000
998499 99999  20140913    48.6 24  9999.9  0  9999.9  0  9999.9  0  999.9  0    8.0 24   13.0  999.9    55.0*   43.2*  0.00I 999.9  000000

Build and execution tested 6/23/2015  (FWS)