Filter file (include stations in WMO block 01 with temperature between -10 and 10 only):
<file>
D: 001001 I2.2
01

TA >= -10
TA < 10
</file>

Output:
<file>
wmonr=01431
TA=7.2
RR_12=0.0

wmonr=01417
TA=8.7
RR_12=0.4

wmonr=01167
TA=9.1
RR_12=0.0

wmonr=01047
TA=5.8
RR_12=0.0

wmonr=01350
TA=7.7
RR_12=0.0

...
</file>