Notation	Name	Description	Status
0	Cloud development not observed or not observable		stable
1	Clouds generally dissolving or becoming less developed		stable
2	State of sky on the whole unchanged		stable
3	Clouds generally forming or developing		stable
4	Visibility reduced by smoke, e.g. veldt or forest fires, industrial smoke or volcanic ashes		stable
5	Haze		stable
6	Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation		stable
7	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 sea stations and coastal stations, blowing spray at the station		stable
8	Well-developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the same time of observation, but no duststorm or sandstorm		stable
9	Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour		stable
10	Mist		stable
11	Patches		stable
12	More or less continuous		stable
13	Lightning visible, no thunder heard		stable
14	Precipitation within sight, not reaching the ground or the surface of the sea		stable
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		stable
16	Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station		stable
17	Thunderstorm, but no precipitation at the time of observation		stable
18	Squalls		stable
19	Funnel cloud(s)		stable
20	Drizzle (not freezing) or snow grains		stable
21	Rain (not freezing)		stable
22	Snow		stable
23	Rain and snow or ice pellets		stable
24	Freezing drizzle or freezing rain		stable
25	Shower(s) of rain		stable
26	Shower(s) of snow, or of rain and snow		stable
27	Shower(s) of hail*, or of rain and hail*		stable
28	Fog or ice fog		stable
29	Thunderstorm (with or without precipitation)		stable
30	Slight or moderate duststorm or sandstorm		stable
31	Slight or moderate duststorm or sandstorm		stable
32	Slight or moderate duststorm or sandstorm		stable
33	Severe duststorm or sandstorm		stable
34	Severe duststorm or sandstorm		stable
35	Severe duststorm or sandstorm		stable
36	Slight or moderate drifting snow		stable
37	Heavy drifting snow		stable
38	Slight or moderate blowing snow		stable
39	Heavy blowing snow		stable
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		stable
41	Fog or ice fog in patches		stable
42	Fog or ice fog, sky visible		stable
43	Fog or ice fog, sky invisible		stable
44	Fog or ice fog, sky visible		stable
45	Fog or ice fog, sky invisible		stable
46	Fog or ice fog, sky visible		stable
47	Fog or ice fog, sky invisible		stable
48	Fog, depositing rime, sky visible		stable
49	Fog, depositing rime, sky invisible		stable
50	Drizzle, not freezing, intermittent		stable
51	Drizzle, not freezing, continuous		stable
52	Drizzle, not freezing, intermittent		stable
53	Drizzle, not freezing, continuous		stable
54	Drizzle, not freezing, intermittent		stable
55	Drizzle, not freezing, continuous		stable
56	Drizzle, freezing, slight		stable
57	Drizzle, freezing, moderate or heavy (dense)		stable
58	Drizzle and rain, slight		stable
59	Drizzle and rain, moderate or heavy		stable
60	Rain, not freezing, intermittent		stable
61	Rain, not freezing, continuous		stable
62	Rain, not freezing, intermittent		stable
63	Rain, not freezing, continuous		stable
64	Rain, not freezing, intermittent		stable
65	Rain, not freezing, continuous		stable
66	Rain, freezing, slight		stable
67	Rain, freezing, moderate or heavy		stable
68	Rain or drizzle and snow, slight		stable
69	Rain or drizzle and snow, moderate or heavy		stable
70	Intermittent fall of snowflakes		stable
71	Continuous fall of snowflakes		stable
72	Intermittent fall of snowflakes		stable
73	Continuous fall of snowflakes		stable
74	Intermittent fall of snowflakes		stable
75	Continuous fall of snowflakes		stable
76	Diamond dust (with or without fog)		stable
77	Snow grains (with or without fog)		stable
78	Isolated star-like snow crystals (with or without fog)		stable
79	Ice pellets		stable
80	Rain shower(s), slight		stable
81	Rain shower(s), moderate or heavy		stable
82	Rain shower(s), violent		stable
83	Shower(s) of rain and snow mixed, slight		stable
84	Shower(s) of rain and snow mixed, moderate or heavy		stable
85	Snow shower(s), slight		stable
86	Snow shower(s), moderate or heavy		stable
87	Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed		stable
88	Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed		stable
89	Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder		stable
90	Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder		stable
91	Slight rain at time of observation		stable
92	Moderate or heavy rain at time of observation		stable
93	Slight snow, or rain and snow mixed or hail* at time of observation		stable
94	Moderate or heavy snow, or rain and snow mixed or hail* at time of observation		stable
95	Thunderstorm, slight or moderate, without hail*, but with rain and/or snow at time of observation		stable
96	Thunderstorm, slight or moderate, with hail* at time of observation		stable
97	Thunderstorm, heavy, without hail*, but with rain and/or snow at time of observation		stable
98	Thunderstorm combined with duststorm or sandstorm at time of observation		stable
99	Thunderstorm, heavy, with hail* at time of observation		stable
100	No significant weather observed		stable
101	Clouds generally dissolving or becoming less developed during the past hour		stable
102	State of sky on the whole unchanged during the past hour		stable
103	Clouds generally forming or developing during the past hour		stable
104	Haze or smoke, or dust in suspension in the air, visibility equal to, or greater than, 1 km		stable
105	Haze or smoke, or dust in suspension in the air, visibility less than 1 km		stable
110	Mist		stable
111	Diamond dust		stable
112	Distant lightning		stable
118	Squalls		stable
120	Fog		stable
121	PRECIPITATION		stable
122	Drizzle (not freezing) or snow grains		stable
123	Rain (not freezing)		stable
124	Snow		stable
125	Freezing drizzle or freezing rain		stable
126	Thunderstorm (with or without precipitation)		stable
127	BLOWING OR DRIFTING SNOW OR SAND		stable
128	Blowing or drifting snow or sand, visibility equal to, or greater than, 1 km		stable
129	Blowing or drifting snow or sand, visibility less than 1 km		stable
130	FOG		stable
131	Fog or ice fog in patches		stable
132	Fog or ice fog, has become thinner during the past hour		stable
133	Fog or ice fog, no appreciable change during the past hour		stable
134	Fog or ice fog, has begun or become thicker during the past hour		stable
135	Fog, depositing rime		stable
140	PRECIPITATION		stable
141	Precipitation, slight or moderate		stable
142	Precipitation, heavy		stable
143	Liquid precipitation, slight or moderate		stable
144	Liquid precipitation, heavy		stable
145	Solid precipitation, slight or moderate		stable
146	Solid precipitation, heavy		stable
147	Freezing precipitation, slight or moderate		stable
148	Freezing precipitation, heavy		stable
150	DRIZZLE		stable
151	Drizzle, not freezing, slight		stable
152	Drizzle, not freezing, moderate		stable
153	Drizzle, not freezing, heavy		stable
154	Drizzle, freezing, slight		stable
155	Drizzle, freezing, moderate		stable
156	Drizzle, freezing, heavy		stable
157	Drizzle and rain, slight		stable
158	Drizzle and rain, moderate or heavy		stable
160	RAIN		stable
161	Rain, not freezing, slight		stable
162	Rain, not freezing, moderate		stable
163	Rain, not freezing, heavy		stable
164	Rain, freezing, slight		stable
165	Rain, freezing, moderate		stable
166	Rain, freezing, heavy		stable
167	Rain (or drizzle) and snow, slight		stable
168	Rain (or drizzle) and snow, moderate or heavy		stable
170	SNOW		stable
171	Snow, slight		stable
172	Snow, moderate		stable
173	Snow, heavy		stable
174	Ice pellets, slight		stable
175	Ice pellets, moderate		stable
176	Ice pellets, heavy		stable
177	Snow grains		stable
178	Ice crystals		stable
180	SHOWER(S) OR INTERMITTENT PRECIPITATION		stable
181	Rain shower(s) or intermittent rain, slight		stable
182	Rain shower(s) or intermittent rain, moderate		stable
183	Rain shower(s) or intermittent rain, heavy		stable
184	Rain shower(s) or intermittent rain, violent		stable
185	Snow shower(s) or intermittent snow, slight		stable
186	Snow shower(s) or intermittent snow, moderate		stable
187	Snow shower(s) or intermittent snow, heavy		stable
189	Hail		stable
190	THUNDERSTORM		stable
191	Thunderstorm, slight or moderate, with no precipitation		stable
192	Thunderstorm, slight or moderate, with rain showers and/or snow showers		stable
193	Thunderstorm, slight or moderate, with hail		stable
194	Thunderstorm, heavy, with no precipitation		stable
195	Thunderstorm, heavy, with rain showers and/or snow showers		stable
196	Thunderstorm, heavy, with hail		stable
199	Tornado		stable
204	Volcanic ash suspended in the air aloft		stable
205	Not used		stable
206	Thick dust haze, visibility less than 1 km		stable
207	Blowing spray at the station		stable
208	Drifting dust (sand)		stable
209	Wall of dust or sand in distance (like haboob)		stable
210	Snow haze		stable
211	Whiteout		stable
212	Not used		stable
213	Lightning, cloud to surface		stable
217	Dry thunderstorm		stable
218	Not used		stable
219	Tornado cloud (destructive) at or within sight of the station during preceding hour or at the time of observation		stable
220	Deposition of volcanic ash		stable
221	Deposition of dust or sand		stable
222	Deposition of dew		stable
223	Deposition of wet snow		stable
224	Deposition of soft rime		stable
225	Deposition of hard rime		stable
226	Deposition of hoar frost		stable
227	Deposition of glaze		stable
228	Deposition of ice crust (ice slick)		stable
229	Not used		stable
230	Duststorm or sandstorm with temperature below 0 °C		stable
239	Blowing snow, impossible to determine whether snow is falling or not		stable
240	Not used		stable
241	Fog on sea		stable
242	Fog in valleys		stable
243	Arctic or Antarctic sea smoke		stable
244	Steam fog (sea, lake or river)		stable
245	Steam log (land)		stable
246	Fog over ice or snow cover		stable
247	Dense fog, visibility 60-90 m		stable
248	Dense fog, visibility 30-60 m		stable
249	Dense fog, visibility less than 30 m		stable
250	Drizzle, rate of fall - less than 0.10 mm h-1		stable
251	Drizzle, rate of fall - 0.10-0.19 mm h-1		stable
252	Drizzle, rate of fall - 0.20-0.39 mm h-1		stable
253	Drizzle, rate of fall - 0.40-0.79 mm h-1		stable
254	Drizzle, rate of fall - 0.80-1.59 mm h-1		stable
255	Drizzle, rate of fall - 1.60-3.19 mm h-1		stable
256	Drizzle, rate of fall - 3.20-6.39 mm h-1		stable
257	Drizzle, rate of fall - 6.4 mm h-1 or more		stable
258	Not used		stable
259	Drizzle and snow		stable
260	Rain, rate of fall - less than 1.0 mm h-1		stable
261	Rain, rate of fall - 1.0-1.9 mm h-1		stable
262	Rain, rate of fall - 2.0-3.9 mm h-1		stable
263	Rain, rate of fall - 4.0-7.9 mm h-1		stable
264	Rain, rate of fall - 8.0-15.9 mm h-1		stable
265	Rain, rate of fall - 16.0-31.9 mm h-1		stable
266	Rain, rate of fall - 32.0-63.9 mm h-1		stable
267	Rain, rate of fall - 64.0 mm h-1 or more		stable
270	Snow, rate of fall - less than 1.0 cm h-1		stable
271	Snow, rate of fall - 1.0-1.9 cm h-1		stable
272	Snow, rate of fall - 2.0-3.9 cm h-1		stable
273	Snow, rate of fall - 4.0-7.9 cm h-1		stable
274	Snow, rate of fall - 8.0-15.9 cm h-1		stable
275	Snow, rate of fall - 16.0-31.9 cm h-1		stable
276	Snow, rate of fall - 32.0-63.9 cm h-1		stable
277	Snow, rate of fall - 64.0 cm h-1 or more		stable
278	Snow or ice crystal precipitation from a clear sky		stable
279	Wet snow, freezing on contact		stable
280	Precipitation of rain		stable
281	Precipitation of rain, freezing		stable
282	Precipitation of rain and snow mixed		stable
283	Precipitation of snow		stable
284	Precipitation of snow pellets or small hall		stable
285	Precipitation of snow pellets or small hail, with rain		stable
286	Precipitation of snow pellets or small hail, with rain and snow mixed		stable
287	Precipitation of snow pellets or small hail, with snow		stable
288	Precipitation of hail		stable
289	Precipitation of hail, with rain		stable
290	Precipitation of hall, with rain and snow mixed		stable
291	Precipitation of hail, with snow		stable
292	Shower(s) or thunderstorm over sea		stable
293	Shower(s) or thunderstorm over mountains		stable
508	No significant phenomenon to report, present and past weather omitted		stable
509	No observation, data not available, present and past weather omitted		stable
510	Present and past weather missing, but expected		stable
511	Missing value		stable