0 0 Dew point not measured/aircraft below 10000 m
1 1 Dew point not measured/aircraft at or above 10000 m
2 2 Dew point not measured/aircraft below 10000 m and flight level temperature -50 Celsius or colder
3 3 Dew point not measured/aircraft at or above 10000 m and flight level temperature -50 Celsius or colder
4 4 Dew point measured/aircraft below 10000 m
5 5 Dew point measured/aircraft at or above 10000 m
6 6 Dew point measured/aircraft below 10000 m and flight level temperature -50 Celsius or colder
7 7 Dew point measured/aircraft at or above 10000 m and flight level temperature -50 Celsius or colder
15 15 Missing value
