Extracted data reference

#	Column name	Meaning	Format and Details
1	wmo_id	WMO identifier number
2	Year		UTC time zone; available if parse_ogimet() is used in the data argument
3	Month		UTC time zone; available if parse_ogimet() is used in the data argument
4	Day		UTC time zone. Observations are assumed to occur at the time indicated in Section 0 (Group 9 from Section 1 is currently ignored).
5	Hour		UTC time zone. Observations are assumed to occur at the time indicated in Section 0 (Group 9 from Section 1 is currently ignored).
6	Cloud_base_height	Lowest cloud base height	String, intervals in meters
7	Visibility	Horizontal visibility	In m; 99 means “Less than 100 m”, 71000 means “> 70 km”; 49 means “< 50 m” and 51000 means “>= 50 km”. NA_real_ is returned when visibility is unknown (‘//’).
8	Total_cloud_cover	Total cloud cover	In oktas, 9 means “invisible by fog or other meteorological phenomenon”; “/” is treated as NA_real_
9	Wind_direction	Wind direction	In tens of degree, 99 means “variable wind direction”
10	Wind_speed	Wind speed	The value and its unit are in different but contiguous columns
11	Wind_speed_unit	Wind speed unit	Either ‘m/s’ or ‘knots’
12	Air_temperature	Air temperature	in degrees Celsius
13	Dew_point	Dew Point	in degrees Celsius (in very rare cases this group is replaced by “29UUU” to inform relative humidity (UUU) instead of dew point; this feature is currently not supported and will lead to incorrect dew point and relative humidity values)
14	Relative_humidity	Relative humidity according to Magnus-Tetens Equation	As a percentage
15	Station_pressure	Station pressure	in hPa
16	MSLP_GH	Mean sea level pressure or geopotential height	in hPa or gpm; for geopotential height, only pressure level 850 hPa, 700 hPa and 500 hPa are supported, the rest will lead to a wrong value
17	Pressure_tendency	3-hour pressure tendency	in hPa
18	Charac_pressure_tend	Characteristic of pressure tendency during the three hours preceding the time of observation	Character, “Inc” means “Increasing” and “Dec” means “Decreasing”
19	Precipitation_S1	Amount of precipitation informed in Section 1	in mm (0.01 means trace precipitation)
20	Precip_period_S1	“Precipitation_S1” fell in the last “Precip_period_S1” hours	in hours
21	Present_weather	Present weather	Character - Simplified decoding ; NSW stands for “No significant weather”
22	Past_weather1	Past weather	Character - Simplified decoding; Period of time covered depends on the time of observation (e.g., six hours for observations at 0, 6, 12 and 18 UTC; three hours at 3, 9, 15 and 21 UTC)
23	Past_weather2	Past weather	Character - Simplified decoding; Period of time covered depends on the time of observation (e.g., six hours for observations at 0, 6, 12 and 18 UTC; three hours at 3, 9, 15 and 21 UTC)
24	Cloud_amount_Nh	Total cloud cover from low clouds, or medium clouds if there are no low clouds	In oktas, 9 means “invisible by fog or other meteorological phenomenon”
25	Low_clouds_CL	Low clouds description	String - Simplified decoding
26	Medium_clouds_CM	Medium clouds description	String - Simplified decoding
27	High_clouds_CH	High clouds description	String - Simplified decoding
28	Max_temperature	Maximum temperature	in degrees Celsius - (period of time covered is determined by regional decision)
29	Min_temperature	Minimum temperature	in degrees Celsius - (period of time covered is determined by regional decision)
30	Ground_state	State of the ground without snow or ice	String - Simplified decoding
31	Ground_temperature	Ground minimum temperature (from the previous night)	in degrees Celsius, integer
32	Snow_ground_state	State of the ground with snow or measurable ice cover	String - Simplified decoding
33	Show_depth	Snow depth	in cm, for values between 1 and 996; 997 means “less than 0.5 cm” and is converted to 0.1 cm; 998 “Snow cover, not continuous” and 999 “Measurement impossible or inaccurate” are considered NA
34	Ev_Evt	Daily evaporation (ev) or evapotranspiration (evt)	in mm, only values < 40 mm are handled correctly
35	Sunshine_daily	Daily hours of sunshine, generally from the previos civil day	in hours
36	Positive_Net_Rad_last_24h	Positive net radiation during the previous 24 hours	in J / cm^2
37	Negative_Net_Rad_last_24h	Negative net radiation during the previous 24 hours	in J / cm^2
38	Global_Solar_Rad_last_24h	Global solar radiation during the previous 24 hours	in J / cm^2
39	Diffused_Solar_Rad_last_24h	Diffused solar radiation during the previous 24 hours	in J / cm^2
40	Downward_LongWave_Rad_last_24h	Downward long-wave radiation during the previous 24 hours	in J / cm^2
41	Upward_LongWave_Rad_last_24h	Upward long-wave radiation during the previous 24 hours	in J / cm^2
42	ShortWave_Rad_last_24h	Short-wave radiation during the previous 24 hours	in J / cm^2
43	Net_ShortWave_Rad_last_24h	Net short-wave radiation during the previous 24 hours	in J / cm^2
44	Direct_Solar_Rad_last_24h	Direct solar radiation during the previous 24 hours	in J / cm^2
45	Sunshine_last_hour	Duration of sunshine in the past hour	in hours
46	Positive_Net_Rad_last_hour	Positive net radiation during the previous hour	in kJ / m^2
47	Negative_Net_Rad_last_hour	Negative net radiation during the previous hour	in kJ / m^2
48	Global_Solar_Rad_last_hour	Global solar radiation during the previous hour	in kJ / m^2
49	Diffused_Solar_Rad_last_hour	Diffused solar radiation during the previous hour	in kJ / m^2
50	Downward_LongWave_Rad_last_hour	Downward long-wave radiation during the previous hour	in kJ / m^2
51	Upward_LongWave_Rad_last_hour	Upward long-wave radiation during the previous hour	in kJ / m^2
52	ShortWave_Rad_last_hour	Short-wave radiation during the previous hour	in kJ / m^2
53	Net_ShortWave_Rad_last_hour	Net short-wave radiation during the previous hour	in kJ / m^2
54	Direct_Solar_Rad_last_hour	Direct solar radiation during the previous hour	in kJ / m^2
55	Cloud_drift_direction	Direction of cloud drift	String indicating drift direction (using cardinal and intercardinal points) of low, medium and high clouds, respectively
56	Cloud_elevation_direction	Angle of elevation and direction of cloud	String indicating genera, direction and angle of elevation, respectively
57	Pressure_change_last_24h	Change of surface pressure over the last 24 hours	in hPa
58	Precipitation_S3	Amount of precipitation informed in Section 3	in mm (0.01 means trace precipitation)
59	Precip_period_S3	“Precipitation_S3” fell in the last “Precip_period_S3” hours	in hours
60	Precipitation_last_24h	Total amount of precipitation during the 24-hour period ending at the time of observation	in mm (0.01 means trace precipitation, 999.8 means “999.8 mm or more”)
61	Cloud_layer_1	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
62	Cloud_layer_2	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
63	Cloud_layer_3	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
64	Cloud_layer_4	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m

‘Simplified decoding’ means it’s not exactly decoded as in the WMO Code Tables, but in a way that the description is not too long, for its inclusion in the data frame.

Additional remarks

• There is no support for sections 222 y 444. They will lead to a wrong result or function will crack if not filtered out.
• Section 555 (reserved for national distribution) is quietly removed if present, as its content varies by country.
• Group 54 from section 3 (temperature change), as well as groups 9 from section 1 and 3, are ignored and won’t affect other results.