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About WMO Code Table 4677

Code Table 4677: Present weather reported from a manned weather station

00 - 49 No precipitation at the station at the time of observation
00 - 19 No precipitation, fog, ice fog (except for 11 and 12), duststorm, sandstorm, drifting or blowing snow at the station* at the time of observation or, except for 09 and 17, during the preceding hour
Code Figure Meaning
No meteors except photometeors (00 - 03)
00 Cloud development not observed or not observable Characteristic change of the state of sky during the past hour
01 Clouds generally dissolving or becoming less developed
02 State of sky on the whole unchanged
03 Clouds generally forming or developing
Haze, dust, sand or smoke (04 - 09)
04 Visibility reduced by smoke,e.g. veldt or forest fires, industrial smoke or volcanic ashes
05 Haze
06 Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation
07 Dust or sand raised by wind at or near the station at the time of observation, but no well-developed dust whirl(s) or sand whirl(s), and no duststorm, or sandstorm seen; or, in the case of ships, blowing spray at the station
08 Well-developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the time of observation, but no duststorm or sandstorm
09 Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour
10 Mist

11 Patches shallow fog or ice fog at the station, whether on land or sea, not deeper than about 2 meters on land or 10 m at sea
12 More or less continuous
13 Lightning visible, no thunder heard
14 Precipitation within sight, not reaching the ground or the surface of the sea
15 Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station
16 Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station
17 Thunderstorm, but no precipitation at the time of observation
18 Squalls at or within sight of the station during the preceding hour or at the time of observation
19 Funnel cloud(s)**
20 - 29 Precipitation, fog, ice fog or thunderstorm at the station during the preceding hour but not at the time of observation
20 Drizzle (not freezing) or snow grains not falling as shower(s)
21 Rain (not freezing)
22 Snow
23 Rain and snow or ice pellets
24 Freezing drizzle or freezing rain
25 Shower(s) of rain
26 Shower(s) of snow, or of rain and snow
27 Shower(s) of hail***, or of rain and hail
28 Fog or ice fog
29 Thunderstorm (with or withour precipitaion)
30 - 39 Duststorm, sandstorm, drifting or blowing snow
30 Slight or moderate duststorm or sandstorm has decreased during the preceding hour
31 no appreciable change during the preceding hour
32 has begun or has increased during the preceding hour
33 Severe duststorm or sandstorm has decreased during the preceding hour
34 no appreciable change during the preceding hour
35 has begun or has increased during the preceding hour
36 Slight or moderate drifting snow generally low (below eye level)
37 Heavy drifting snow
38 Slight or moderate blowing snow generally high (above eye level)
39 Heavy blowing snow
40 - 49 Fog or ice fog at the time of observation
40 Fog or ice fog at a distance at the time of observation, but not at the station during the preceding hour, the fog or ice fog extending to a level above that of the observer
41 Fog or ice fog in patches
42 Fog or ice fog, sky visible has become thinner during the preceding hour
43 Fog or ice fog, sky invisible
44 Fog or ice fog, sky visible no appreciable change during the preceding hour
45 Fog or ice fog, sky invisible
46 Fog or ice fog, sky visible has begun or has become thicker during the preceding hour
47 Fog or ice fog, sky invisible
48 Fog, depositing rime, sky visible
49 Fog, depositing rime, sky invisible
50 - 99 Precipitation at the station at the time of observation
50 - 59 Drizzle
50 Drizzle, not freezing, intermittent Slight at time of observation
51 Drizzle, not freezing, continuous
52 Drizzle, not freezing, intermittent Moderate at time of observation
53 Drizzle, not freezing, continuous
54 Drizzle, not freezing, intermittent Heavy (dense) at time of observation
55 Drizzle, not freezing, continuous
56 Drizzle, freezing, slight
57 Drizzle, freezing, moderate or heavy (dense)
58 Drizzle and rain, slight
59 Drizzle and rain, moderate or heavy
60 - 69 Rain
60 Rain, not freezing, intermittent Slight at time of observation
61 Rain, not freezing, continuous
62 Rain, not freezing, intermittent Moderate at time of observation
63 Rain, not freezing, continuous
64 Rain, not freezing, intermittent heavy at time of observation
65 Rain, not freezing, continuous
66 Rain, freezing, slight
67 Rain, freezing, moderate or heavy
68 Rain, or drizzle and snow, slight
69 Rain, or drizzle and snow, moderate or heavy
70 - 79 Solid precipitation not in showers
70 Intermittent fall of snowflakes Slight at time of observation
71 Continuous fall of snowflakes
72 Intermittent fall of snowflakes Moderate at time of observation
73 Continuous fall of snowflakes
74 Intermittent fall of snowflakes heavy at time of observation
75 Continuous fall of snowflakes
76 Diamond dust (without or without fog)
77 Snow grains (without or without fog)
78 Isolated star-like snow crystals (without or without fog)
79 Ice pellets
80 - 99 Showery precipitation, or precipitation with current or recent thunderstorm
80 Rain shower(s), slight
81 Rain shower(s), moderate or heavy
82 Rain shower(s), violent
83 Shower(s) of rain and snow, mixed, slight
84 Shower(s) of rain and snow, mixed, moderate or heavy
85 Snow shower(s), slight
86 Snow shower(s), moderate or heavy
87 Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed slight
88 moderate or heavy
89 Shower(s) of hail**** with or without rain or rain and snow mixed not associated with thunder slight
90 moderate or heavy
91 Slight rain at time of observation Thunderstorm during the preceding hour but not at time observation
92 Moderate or heavy rain at time of observation
93 Slight snow, or rain and snow mixed or hail*** at time of observation
94 Moderate or heavy snow, or rain and snow mixed or hail*** at time of observation
95 Thunderstorm, slight or moderate, without hail***, but with rain and/or snow at time of observation Thunderstorm at time observation
96 Thunderstorm, slight or moderate, with hail*** at time of observation
97 Thunderstorm, heavy, without hail***, but with rain and/or snow at time of observation
98 Thunderstorm combined with duststorm or sandstorm at time of observation
99 Thunderstorm, heavy, with hail*** at time of observation

* The expression "at the station" refers to a land station or a ship

** Tornado cloud or water spout

*** Hail, small hail, snow pellets. French: grêle, grésil ou neige coulée

**** French: grêle