Cloudiness
clear partly cloudy cloudy mostly cloudy overcast

 

Rain intensity (mm/24h)
snow rain

 

mm Rain Rain/Snow Snow
light < 5
moderate 5 - 15
heavy 15 - 40
very heavy > 40

 

Probability of precipitation
very low < 25%
low 25 - 50%
high 50 - 75%
very high 75 - 100%

 

Wind speed (m/s)
calm < 0,5
light 0,5 - 4
moderate 4 - 8
strong 8 - 14
very strong > 14

 

Visibility
excellent > 10 Km 
good 4 - 10 Km
moderate 1 - 4 Km (haze)
poor < 1 km (fog)

 

Various symbols
fog thunderstorm