Campbell Scientific CS125 Present Weather Sensor - Manual (Page 31)

User Guide
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11.5 SYNOP Codes produced by the CS125
The following SYNOP codes from WMO table 4680 can be output by the CS125.
00 No significant weather observed
04 Haze or smoke, or dust in suspension in the air, visibility equal to, or greater
than, 1 km
05 Haze or smoke, or dust in suspension in the air, visibility less than 1 km
Note: Codes 04 and 05 will only be returned if a CS215 is present to provide
relative humidity, otherwise they will default to mist (10) or fog (20, 30 or 35).
10 Mist
Code figures 20–26 are used to report precipitation, fog (or ice fog) or
thunderstorm at the station during the preceding hour but not at the time of
observation.
20 Fog
21 PRECIPITATION
22 Drizzle (not freezing) or snow grains
23 Rain (not freezing)
24 Snow
25 Freezing drizzle or freezing rain
30 FOG
35 Fog, depositing rime
40 PRECIPITATION
51 Drizzle, not freezing, slight
52 Drizzle, not freezing, moderate
53 Drizzle, not freezing, heavy
54 Drizzle, freezing, slight
55 Drizzle, freezing, moderate
56 Drizzle, freezing, heavy
57 Drizzle and rain, slight
58 Drizzle and rain, moderate or heavy
61 Rain, not freezing, slight
62 Rain, not freezing, moderate
63 Rain, not freezing, heavy
64 Rain, freezing, slight
65 Rain, freezing, moderate
66 Rain, freezing, heavy
67 Rain (or drizzle) and snow, slight
68 Rain (or drizzle) and snow, moderate or heavy
71 Snow, slight
72 Snow, moderate
73 Snow, heavy