class | critera |
clear |
cloud cover in any height < 1% |
clearABL |
cloud cover below 3km < 1% |
little |
cloud cover in any height < 5% |
littleABL |
cloud cover below 3km < 5% |
clearDay |
cloud cover in any height < 1% during daytime |
clearDayABL |
cloud cover below 3km < 1% during daytime |
littleDay |
cloud cover in any height < 5% during daytime |
littleDayABL |
cloud cover below 3km < 5% during daytime |