2snTdTdTd
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2 - Indicator figure for dew-point group

sn - Sign of temperature
Code                            Description
0                                  Temperature positive or zero
1                                  Temperature negative

TdtdTd - Dew-point temperature in whole degrees and tenths
e.g.
20.7°C is coded 207
0.3°C is coded 003

Note (Supplementary ships and Auxiliary ships only)