Low Cloud
Code 0 - No low clouds Code 1 - Cumulus with little vertical extent Code 2 - Cumulus with moderate or strong vertical extent Code 3 - Cumulonimbus not in the form of anvil Code 4 - Stratocumulus formed by spreading out of Cumulus Code 5 - Stratocumulus not formed by spreading out of Cumulus Code 6 - Stratus in a more or less continuous sheet or layer Code 7 - Stratus of bad weather Code 8 - Cumulus and Stratocumulus other than that formed from spreading of Cumulus Code 9 - Cumulonimbus often in the form of anvil Code / - Low cloud(s) invisible owing to darkness, fog, blowing dust etc.
0 Octa 1 Octa 2 Octa 3 Octa 4 Octa 5 Octa 6 Octa 7 Octa 8 Octa 9 Sky obscured or cloud amount cannot be estimated
Medium Cloud
Code 0 - No Medium clouds Code 1 - Altostratus, the greater part of which is semi-transparent Code 2 - Altostratus, the greater part of which is sufficiently dense Code 3 - Altocumulus, the greater part of which is semi-transparent Code 4 - Patches of Altocumulus, the greater part of which is semi-transparent Code 5 - Semi-transparent Altocumulus in bands progressively invading the sky Code 6 - Altocumulus resulting from spreading out of Cumulus Code 7 - Altocumulus in two or more layers usually opaque in places Code 8 - Altocumulus sprouting in the form of small towers 9 - Altocumulus of a chaotic sky, generally at several levels Code / - Medium cloud(s) invisible owing to darkness, fog, blowing dust etc.
0 Octa 1 Octa 2 Octa 3 Octa 4 Octa 5 Octa 6 Octa 7 Octa 8 Octa 9 Sky obscured or cloud amount cannot be estimated
High Cloud
Code 0 - No high clouds Code 1 - Cirrus in the form of hooks progressively invading the sky Code 2 - Dense Cirrus having the appearance of cumuliform tufts Code 3 - Dense Cirrus often in the form of an anvil Code 4 - Cirrus in the form of hooks progressively invading the sky becoming dense Code 5 - Cirrus often in bands converging towards horizon but the continuous veil does not reach 45 degree above the horizon Code 6 - Cirrus often in bands converging towards horizon but the continuous veil extends more than 45 degree above the horizon Code 7 - Veil of cirrostratus covering the celestial dome Code 8 - Cirrostratus not progressively invading the sky and not covering the celestial dome completely Code 9 - Cirrocumulus / Cirrostratus / Cirrus but Cirrocumulus is predominant Code / - High cloud(s) invisible owing to darkness, fog, blowing dust etc.
0 Octa 1 Octa 2 Octa 3 Octa 4 Octa 5 Octa 6 Octa 7 Octa 8 Octa 9 Sky obscured or cloud amount cannot be estimated
Lowest Cloud Height:
Code 0 - Height 0 to 49 m Code 1- Height 50 to 99 m Code 2- Height 100 to 199 m Code 3- Height 200 to 299 m Code 4- Height 300 to 599 m Code 5- Height 600 to 999 m Code 6- Height 1000 to 1499 m Code 7- Height 1500 to 1999 m Code 8- Height 2000 to 2500 m Code 9 - No Cloud below 2500 m Code / - Sky obscured or cloud amount cannot be estimated
Past Weather Code:
Code 0 - No weather Code 1 - Cloud covering more than ½ the sky during part of the appropriate period and covering ½ or less during part of the period Code 2 - Cloud covering more than ½ of the sky throughout the appropriate period Code 3 - Sandstorm, dust storm or blowing snow Code 4 - For or ice fog or thick haze Code 5 - Drizzle Code 6 - Rain Code 7 - Snow, or rain and snow mixed Code 8 - Shower Code 9 - Thunderstorm(s) with or without precipitation
Code 0 - No weather Code 1 - Cloud covering more than ½ the sky during part of the appropriate period and covering ½ or less during part of the period
Visibility
Code 90 - Day Visibility < 050 m [Night Visibility < 100 m] Code 91 - Day Visibility < 200 m [Night Visibility < 330 m] Code 92 - Day Visibility < 500 m [Night Visibility < 1000 m] Code 93 - Day Visibility < 01 km [Night Visibility < 1340 m] Code 94 - Day Visibility < 02 km [Night Visibility < 2330 m] Code 95 - Day Visibility < 04 km [Night Visibility < 4000 m] Code 96 - Day Visibility < 10 km [Night Visibility < 7500 m] Code 97 - Day Visibility < 20 km [Night Visibility < 12 km] Code 98 - Day Visibility < 50 km Code 99 - Day Visibility >= 50 km
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