Description of data set, referring to the ASCII code of the CLIMAT reports, FM 71 Parameters of section 1 of the CLIMAT report: year;month;IIiii;G1;Po;G1;P;G1;sn;T;st;G1;sn;Tx;sn;Tn;G1;e;G1;R1;Rd;nr; G1;S1;ps;G1;mp;mT;mTx;mTn;G1;me;mR;mS sn = Sign of the data, coded 0 Positive or zero (for temperature) 1 Negative (for temperature) 9 Indicator that relative humidity follows year month = Month of the year IIiii = WMO Station number G1 = group index of section 1 of the CLIMAT report Po = Monthly mean pressure at station level, in tenths of a hectopascal P = Monthly mean sea level pressure, in tenths of a hectopascal, or for stations in mountainous regions monthly mean geopotential, in standard geopotential metres sn = Sign of the data, and relative humidity indicator T = Monthly mean air temperature, in tenths of a degree Celsius, its sign being given by sn st = Standard deviation of daily mean temperatures of the month, in tenths of a degree Celsius Tx = Mean daily maximum air temperature of the month, in tenths of a degree Celsius, its sign being given by sn Tn = Mean daily minimum air temperature of the month, in tenths of a degree Celsius, its sign being given by sn e = Mean vapour pressure for the month, in tenths of a hectopascal R1 = Total precipitation for the month in millimetres Rd = Frequency group (quintile) within R1 falls nr = Number of days in the month with precipitation equal to or greater than 1 millimetreS1 = Total sunshine for the month in hours ps = Percentage of total sunshine duration relative to the normal mP = Number of days missing from the records for pressure mT = Number of days missing from the records for air temperature mTx = Number of days missing from the record for daily maximum air temperature mTn = Number of days missing from the record for daily minimum air temperature me = Number of days missing from the records for vapour pressure mR = Number of days missing from the records for precipitation mS = Number of days missing from the records for sunshine duration Parameters of section 2 of the CLIMAT report (long-term averages): G2;Yb;Yc;G2;Po;G2;P;G2;sn;T;st;G2;sn;Tx;sn;Tn;G2;e;G2;R1;nr;G2;S1;G2;YP;YT;YTx;G2;Ye;YR;YS; G2 = group index of section 2 Yb = Year of beginning of the reference period Yc = Year of ending of the reference period Po = Monthly mean pressure at station level, in tenths of a hectopascal P = Monthly mean pressure, in tenths of a hectopascal or for stations in mountainous regions monthly mean geopotential, in standard geopotential metres sn = Sign of the data, and relative humidity indicator T = Monthly mean air temperature, in tenths of a degree Celsius, its sign being given by sn st = Standard deviation of daily mean values relative to the monthly mean air temperature, in tenths of a degree Celsius Tx = Mean daily maximum air temperature of the month, in tenths of a degree Celsius, its sign being given by sn Tn = Mean daily minimum air temperature of the month, in tenths of a degree Celsius, its sign being given by sn e = Mean vapour pressure for the month, in tenths of a hectopascal R1 = Total precipitation for the month in millimetres nr = Number of days in the month with precipitation equal to or greater than 1 millimetre S1 = Total sunshine for the month in hours yP = Number of missing years within the reference period from the calculation of pressure normal yR = Number of missing years within the reference period from the calculation of normal for precipitation yS = Number of missing years within the reference period from the calculation of normal for sunshine duration yT = Number of missing years within the reference period from the calculation of normal for mean air temperature yTx = Number of missing years within the reference period from the calculation of normal for mean extreme air temperature ye = Number of missing years within the reference period from the calculation of vapour pressure normal Parameters of section 3 of the CLIMAT report: G3;T25;T30;G3;T35;T40;G3;Tn0;Tx0;G3; R01;R05;G3;R10;R50;G3;R100;R150;G3;s00;s01; G3;s10;s50;G3;f10;f20;f30;G3;V1;V2;V3; G3 = group index of section 3 T25 = Number of days in the month with maximum air temperature equal to or more than 25°C T30 = Number of days in the month with maximum air temperature equal to or more than 30°C T35 = Number of days in the month with maximum air temperature equal to or more than 35°C T40 = Number of days in the month with maximum air temperature equal to or more than 40°C Tn0 = Number of days in the month with minimum air temperature less than 0°C Tx0 = Number of days in the month with maximum air temperature less than 0°C R01 = Number of days in the month with precipitation equal to or more than 1.0 mm R05 = Number of days in the month with precipitation equal to or more than 5.0 mm R10 = Number of days in the month with precipitation equal to or more than 10.0 mm R50 = Number of days in the month with precipitation equal to or more than 50.0 mm R100 = Number of days in the month with precipitation equal to or more than 100.0 mm R150 = Number of days in the month with precipitation equal to or more than 150.0 mm s00 = Number of days in the month with snow depth more than 0 cm s01 = Number of days in the month with snow depth more than 1 cm s10 = Number of days in the month with snow depth more than 10 cm s50 = Number of days in the month with snow depth more than 50 cm f10 = Number of days in the month with observed or recorded wind speed equal to or more than 10 metres per second or 20 knots f20 = Number of days in the month with observed or recorded wind speed equal to or more than 20 metres per second or 40 knots f30 = Number of days in the month with observed or recorded wind speed equal to or more than 30 metres per second or 60 knots V1 = Number of days in the month with observed or recorded visibility less than 50 m, irrespective of the duration of the observational period V2 = Number of days in the month with observed or recorded visibility less than 100 m, irrespective of the duration of the observational period V3 = Number of days in the month with observed or recorded visibility less than 1 000 m, irrespective of the duration of the observational period Parameters of section 4 of the CLIMAT report: G4;sn;Txd;yx;G4;sn;Tnd;yn;G4;sn;Tax;yax;G4;sn;Tan;yan;G4;Rx;yr;G4;iw;fx;yfx;G4;Dts;Dgr;G4;iy;Gx;Gn G4 = group index of section 4 sn = sign of the data, and relative humidity indicator Txd = Highest daily mean air temperature of the month, in tenths of a degree Celsius, its sign being given by sn yx = Day of highest daily mean air temperature during the month Tnd = Lowest daily mean air temperature of the month, in tenths of a degree Celsius, its sign being given by sn yn = Day of lowest daily mean air temperature during the month Tax = Highest air temperature of the month, in tenths of a degree Celsius, its sign being given by sn yax = Day of highest air temperature during the month Tan = Lowest air temperature of the month, in tenths of a degree Celsius, its sign being given by sn yan = Day of lowest air temperature during the month Rx = Highest daily amount of precipitation during the month, in tenths of a millimetre yr = Day of highest daily amount of precipitation during the month iw = Indicator for source and units of wind speed fx = Highest gust wind speed observed or recorded during the month, in tenths of units indicated by iw yfx = Day of highest observed or recorded wind speed during the month Dts = Number of days in the month with thunderstorm(s). Dgr = Number of days in the month with hail. iy = Indicator to specify type of reading of extreme temperatures (only to report in the case of changes) Gn = Principal time of daily reading in UTC (hours) of minimum extreme temperature Gx = Principal time of daily reading in UTC (hours) of maximum extreme temperature