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	Day		UTC time zone
4	Hour		UTC time zone
5	Cloud_base_height	Lowest cloud base height	String, intervals in meters
6	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_character_ is returned when visibility is unknown (‘//’).
7	Total_cloud_cover	Total cloud cover	In oktas, 9 means “invisible by fog or other meteorological phenomenon”; “/” is treated as NA_real_
8	Wind_direction	Wind direction	In tens of degree, 99 means “variable wind direction”
9	Wind_speed	Wind speed	The value and its unit are in different but contiguous columns
10	Wind_speed_unit	Wind speed unit	Either ‘m/s’ or ‘knots’
11	Air_temperature	Air temperature	in degrees Celsius
12	Dew_point	Dew Point	in degrees Celsius (in very rare cases this group is replaced by the group “29UUU” to inform relative humidity instead of dew point; this feature is currently not supported and will lead to a wrong value)
13	Relative_humidity	Relative humidity according to Magnus-Tetens Equation	As a percentage
14	Station_pressure	Station pressure	in hPa
15	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
16	Pressure_tendency	3-hour pressure tendency	in hPa
17	Charac_pressure_tend	Characteristic of pressure tendency during the three hours preceding the time of observation	Character, “Inc” means “Increasing” and “Dec” means “Decreasing”
18	Precipitation_S1	Amount of precipitation informed in Section 1	in mm (0.01 means trace precipitation)
19	Precip_period_S1	“Precipitation_S1” fell in the last “Precip_period_S1” hours	in hours
20	Present_weather	Present weather	Character - Simplified decoding ; NSW stands for “No significant weather”
21	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)
22	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)
23	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”
24	Low_clouds_CL	Low clouds description	Not decoded; “/” is mapped to 10
25	Medium_clouds_CM	Medium clouds description	Not decoded; “/” is mapped to 10
26	High_clouds_CH	High clouds description	Not decoded; “/” is mapped to 10
27	Max_temperature	Maximum temperature	in degrees Celsius - (period of time covered is determined by regional decision)
28	Min_temperature	Minimum temperature	in degrees Celsius - (period of time covered is determined by regional decision)
29	Ground_state	State of the ground without snow or ice	Character - Simplified decoding
30	Ground_temperature	Ground minimum temperature (from the previous night)	in degrees Celsius, integer
31	Snow_ground_state	State of the ground with snow or measurable ice cover	Character - Simplified decoding
32	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
33	Ev_Evt	Daily evaporation (ev) or evapotranspiration (evt)	in mm, only values < 40 mm are handled correctly
34	Sunshine_daily	Daily hours of sunshine, generally from the previos civil day	in hours
35	Positive_Net_Rad_last_24h	Positive net radiation during the previous 24 hours	in J / cm^2
36	Negative_Net_Rad_last_24h	Negative net radiation during the previous 24 hours	in J / cm^2
37	Global_Solar_Rad_last_24h	Global solar radiation during the previous 24 hours	in J / cm^2
38	Diffused_Solar_Rad_last_24h	Diffused solar radiation during the previous 24 hours	in J / cm^2
39	Downward_LongWave_Rad_last_24h	Downward long-wave radiation during the previous 24 hours	in J / cm^2
40	Upward_LongWave_Rad_last_24h	Upward long-wave radiation during the previous 24 hours	in J / cm^2
41	ShortWave_Rad_last_24h	Short-wave radiation during the previous 24 hours	in J / cm^2
42	Net_ShortWave_Rad_last_24h	Net short-wave radiation during the previous 24 hours	in J / cm^2
43	Direct_Solar_Rad_last_24h	Direct solar radiation during the previous 24 hours	in J / cm^2
44	Sunshine_last_hour	Duration of sunshine in the past hour	in hours
45	Positive_Net_Rad_last_hour	Positive net radiation during the previous hour	in kJ / m^2
46	Negative_Net_Rad_last_hour	Negative net radiation during the previous hour	in kJ / m^2
47	Global_Solar_Rad_last_hour	Global solar radiation during the previous hour	in kJ / m^2
48	Diffused_Solar_Rad_last_hour	Diffused solar radiation during the previous hour	in kJ / m^2
49	Downward_LongWave_Rad_last_hour	Downward long-wave radiation during the previous hour	in kJ / m^2
50	Upward_LongWave_Rad_last_hour	Upward long-wave radiation during the previous hour	in kJ / m^2
51	ShortWave_Rad_last_hour	Short-wave radiation during the previous hour	in kJ / m^2
52	Net_ShortWave_Rad_last_hour	Net short-wave radiation during the previous hour	in kJ / m^2
53	Direct_Solar_Rad_last_hour	Direct solar radiation during the previous hour	in kJ / m^2
54	Cloud_drift_direction	Direction of cloud drift	String indicating drift direction (using cardinal and intercardinal points) of low, medium and high clouds, respectively
55	Cloud_elevation_direction	Angle of elevation and direction of cloud	String indicating genera, direction and angle of elevation, respectively
56	Pressure_change_last_24h	Change of surface pressure over the last 24 hours	in hPa
57	Precipitation_S3	Amount of precipitation informed in Section 3	in mm (0.01 means trace precipitation)
58	Precip_period_S3	“Precipitation_S3” fell in the last “Precip_period_S3” hours	in hours
59	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”)
60	Cloud_layer_1	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
61	Cloud_layer_2	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
62	Cloud_layer_3	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m
63	Cloud_layer_4	Layer of cloud	String indicating cloud cover (in oktas), genera and cloud height in m