| Code/Flag Figure |
Description |
Status |
|
0
|
On direct sun
|
Operational
|
|
1
|
On direct moon
|
Operational
|
|
2
|
On blue zenith sky
|
Operational
|
|
3
|
On zenith cloud (uniform stratified layer of small opacity)
|
Operational
|
|
4
|
On zenith cloud (uniform or moderately variable layer of medium opacity)
|
Operational
|
|
5
|
On zenith cloud (uniform or moderately variable layer of large opacity)
|
Operational
|
|
6
|
On zenith cloud (highly variable opacity, with or without precipitation)
|
Operational
|
|
7
|
On zenith cloud (fog)
|
Operational
|
|
8
|
On zenith haze
|
Operational
|
|
9
|
On direct sun through thin cloud, fog or haze
|
Operational
|
|
10-14
|
Reserved
|
Operational
|
|
15
|
Missing value
|
Operational
|