Using parameter file param1:
<file>
wmonr
FF
NN
</file>

and filter file  filter1 (to exclude observations not containing all of the parameters above):
<file>

wmonr
FF
NN
</file>

produced this output when executing bufrdump.pl on a BUFR SYNOP file with options **%%--filter1 --param param1 --csv --delimiter ','%%**

<file>
wmonr,FF,NN
01278,0.0,7
94120,7.2,1
94132,0.0,1
94150,5.7,5
94238,3.1,7
94326,5.7,8
94327,4.6,8
94462,8.2,1
95322,5.7,8
...
</file>

The units for wind speed FF is m/s, for cloud cover NN the code figures in WMO code table 2700 is used (roughly corresponding to counting octas).