Synop Code - Present weather

--	00 - 04: characteristic state of the sky during the past hour
00	Cloud development not observed or observable
01	Clouds dissolving or becoming less developed
02	State of sky on the whole unchanged
03	Clouds generally forming or developing
04	Visibility reduced by smoke haze
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 the wind at or near the station at the time of the observation, but no well-developed dust whirl(s), and no 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 of shallow fog or ice fog
12	More or less continuous
13	Lightning visible, no thunder heard
14	Precipitation within sight, not reaching the ground or surface of sea
15	Precipitation within sight, reaching 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
19	Funnel cloud(s) or tuba during the preceding hour or at time of observation

--	20 - 24: Not falling as shower (s)
20	Drizzle (not freezing) or snow grains
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 without precipitation)

30	Slight duststorm ( has decreased during the preceding hour )
31	Moderate duststorm ( no appreciable change during the preceding hour)
32	Sandstorm ( has begun or increased during the preceding hour)
33	Severe Sandstorm ( has decreased during the preceding hour)
34	Duststorm ( no appreciable change during the preceding hour)
35	Sandstorm ( has begun or increased during the preceding hour)
36	Slight or moderate drifting snow ( generally low)
37	Heavy drifting snow ( below eye level)
38	Slight or moderate blowing snow ( generally high)
39	Heavy blowing snow ( above eye level)

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 obscured ( has become thinner during the preceding hour)
44	Fog or ice fog, sky visible ( no appreciable change)
45	Fog or ice fog, sky obscured ( during the preceding hour)
46	Fog or ice fog, sky visible ( has begun or has become thicker during the preceding hour)
47	Fog or ice fog, sky obscured ( has begun or has become thicker during the preceding hour)
48	Fog or ice fog, sky visible
49	Fog or ice fog, sky obscured

50	Drizzle, not freezing, intermittent ( slight at time of observation)
51	Drizzle, not freezing, continuous ( slight at time of observation)
52	Drizzle, not freezing, intermittent ( moderate at time of observation)
53	Drizzle, not freezing, continuous ( moderate at time of observation)
54	Drizzle, not freezing, intermittent ( heavy (dense) at time of observation)
55	Drizzle, not freezing, continuous ( heavy (dense) at time of observation)
56	Drizzle, freezing, slight
57	Drizzle, freezing, moderate or heavy (dense)
58	Drizzle and rain, slight
59	Drizzle and rain, moderate or heavy

60	Rain, not freezing, intermittent ( slight at time of observation)
61	Rain, not freezing, continuous ( slight at time of observation)
62	Rain, not freezing, intermittent ( moderate at time of observation)
63	Rain, not freezing, continuous ( moderate at time of observation)
64	Rain, not freezing, intermittent ( heavy at time of observation)
65	Rain, not freezing, continuous ( heavy at time of observation)
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	Intermittent fall of snowflakes ( slight at time of observation)
71	Continuous fall of snowflakes ( slight at time of observation)
72	Intermittent fall of snowflakes ( moderate at time of observation)
73	Continuous fall of snowflakes ( moderate at time of observation)
74	Intermittent fall of snowflakes( heavy at time of observation)
75	Continuous fall of snowflakes ( heavy at time of observation)
76	Diamond dust (with or without fog)
77	Snow grains (with or without fog)
78	Isolated star-like snow crystals (with or without fog)
79	Ice pellets

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 ( slight )...
88	...with or without rain or rain and snow mixed ( moderate or heavy)
89	Shower(s) of hail, with or without rain or( slight )...
90	...rain and snow mixed, not associated with thunder ( moderate or heavy)

95	Thunderstorm, slight or moderate, without hail (2) but with rain and or snow at time of observation
96	Thunderstorm, slight or moderate, with hail (2) at time of observation
97	Thunderstorm, heavy, without hail (2) 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 (2) at time of observation

91	Slight rain at time of observation
92	Moderate or heavy rain at time of observation
93	Slight snow, or rain and snow mixed, or hail (2) at time of observation
94	Moderate or heavy snow, or rain and snow mixed, or hail (1) at time of observation