Table 3-2. Data Elements in the TMY2 Format
(For All Except the First Record)





Field
Position

Element

Values

Definition
  002 - 009
  002 - 003
  004 - 005
  006 - 007
  008 - 009
 Local Standard Time
  Year
  Month
  Day
  Hour

    61 - 90
    1 - 12
    1 - 31
    1 - 24

  Year, 1961-1990
  Month
  Day of month
  Hour of day in local standard time
  010 - 013



  Extraterrestrial Horizontal
  Radiation


    0 - 1415



  Amount of solar radiation in Wh/m2
  received on a horizontal surface at the
  top of the atmosphere during the 60
  minutes preceding the hour indicated
  014 - 017




  Extraterrestrial Direct
  Normal Radiation



    0 - 1415




  Amount of solar radiation in Wh/m2
  received on a surface normal to the
  sun at the top of the atmosphere
  during the 60 minutes preceding the
  hour indicated
  018 - 023
  018 - 021
  022
  023
  Global Horizontal Radiation
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 1200
    A - H, ?
    0 - 9
  Total amount of direct and diffuse
  solar radiation in Wh/m2 received on
  a horizontal surface during the 60
  minutes preceding the hour indicated
  024 - 029
  024 - 027
  028
  029
  Direct Normal Radiation
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 1100
    A - H, ?
    0 - 9
  Amount of solar radiation in Wh/m2
  received within a 5.7° field of view
  centered on the sun during the 60
  minutes preceding the hour indicated
  030 - 035
  030 - 033
  034
  035

  Diffuse Horizontal Radiation
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty


    0 - 700
    A - H, ?
    0 - 9

  Amount of solar radiation in Wh/m2
  received from the sky (excluding the
  solar disk) on a horizontal surface
  during the 60 minutes preceding the
  hour indicated
  036 - 041
  036 - 039
  040
  041


  Global Horiz. Illuminance
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty



    0 - 1300
    I, ?
    0 - 9


  Average total amount of direct and
  diffuse illuminance in hundreds of lux
  received on a horizontal surface
  during the 60 minutes preceding the
  hour indicated
  0 to 1300 = 0 to 130,000 lux
  042 - 047
  042 - 045
  046
  047


  Direct Normal Illuminance
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty



    0 - 1100
    I, ?
    0 - 9


  Average amount of direct normal
  illuminance in hundreds of lux
  received within a 5.7° field of view
  centered on the sun during the 60
  minutes preceding the hour indicated.
  0 to 1100 = 0 to 110,000 lux
  048 - 053
  048 - 051
  052
  053


  Diffuse Horiz. Illuminance
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty



    0 - 800
    I, ?
    0 - 9


  Average amount of illuminance in
  hundreds of lux received from the sky
  (excluding the solar disk) on a
  horizontal surface during the 60
  minutes preceding the hour indicated.
  0 to 800= 0 to 80,000 lux
  054 - 059
  054 - 057
  058
  059

  Zenith Luminance
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty
 

    0 - 7000
    I, ?
    0 - 9
   
  Average amount of luminance at the
  sky's zenith in tens of Cd/m2 during
  the 60 minutes preceding the hour
  indicated.
  0 to 7000 = 0 to 70,000 Cd/m2
  060 - 063
  060 - 061
  062
  063
  Total Sky Cover
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 10
    A - F
    0 - 9
  Amount of sky dome in tenths
  covered by clouds or obscuring
  phenomena at the hour indicated

  064 - 067
  064 - 065
  066
  067

  Opaque Sky Cover
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty


    0 - 10
    A - F
    0 - 9

  Amount of sky dome in tenths
  covered by clouds or obscuring
  phenomena that prevent observing the
  sky or higher cloud layers at the hour
  indicated
  068 - 073
  068 - 071
  072
  073
  Dry Bulb Temperature
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

 -500 to 500
    A - F
    0 - 9
  Dry bulb temperature in tenths of °C
  at the hour indicated
  -500 to 500 = -50.0 to 50.0°C

  074 - 079
  074 - 077
  078
  079
  Dew Point Temperature
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

 -600 to 300
    A - F
    0 - 9
  Dew point temperature in tenths of
  °C at the hour indicated
  -600 to 300 = -60.0 to 30.0°C

  080 - 084
  080 - 082
  083
  084
  Relative Humidity
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 100
    A - F
    0 - 9
  Relative humidity in percent at the
  hour indicated


  085 - 090
  085 - 088
  089
  090
  Atmospheric Pressure
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    700 - 1100
    A - F
    0 - 9
  Atmospheric pressure at station in
  millibars at the hour indicated


  091 - 095
  091 - 093
  094
  095
  Wind Direction
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 360
    A - F
    0 - 9
  Wind direction in degrees at the hour
  indicated. ( N = 0 or 360, E = 90,
  S = 180,W = 270 ). For calm winds,
  wind direction equals zero.
  096 - 100
  096 - 098
  099
  100
  Wind Speed
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 400
    A - F
    0 - 9
  Wind speed in tenths of meters per
  second at the hour indicated.
  0 to 400 = 0 to 40.0 m/s

  101 - 106
  101 - 104
  105
  106

  Visibility
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty


    0 - 1609
    A - F, ?
    0 - 9

  Horizontal visibility in tenths of
  kilometers at the hour indicated.
  7777 = unlimited visibility
  0 to 1609 = 0.0 to 160.9 km
  9999 = missing data
  107 - 113
  107 - 111
  112
  113

  Ceiling Height
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty


    0 - 30450
    A - F, ?
    0 - 9

  Ceiling height in meters at the hour
  indicated.
  77777 = unlimited ceiling height
  88888 = cirroform
  99999 = missing data
  114 - 123


  Present Weather


      See
  Appendix B

  Present weather conditions denoted by
  a 10-digit number. See Appendix B
  for key to present weather elements.
  124 - 128
  124 - 126
  127
  128
  Precipitable Water
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 100
    A - F
    0 - 9
  Precipitable water in millimeters at
  the hour indicated


  129 - 133
  129 - 131
  132
  133
  Aerosol Optical Depth
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 240
    A - F
    0 - 9
  Broadband aerosol optical depth
  (broad-band turbidity) in thousandths
  on the day indicated.
  0 to 240 = 0.0 to 0.240
  134 - 138
  134 - 136
  137
  138
  Snow Depth
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0- 150
    A - F, ?
    0 - 9
  Snow depth in centimeters on the day
  indicated.
  999 = missing data
  139 - 142
  139 - 140
  141
  142
  Days Since Last Snowfall
  Data Value
  Flag for Data Source
  Flag for Data Uncertainty

    0 - 88
    A - F, ?
    0 - 9
  Number of days since last snowfall.
  88 = 88 or greater days
  99 = missing data

  FORTRAN Sample Format:
   (1X, 4I2, 2I4, 7 (I4, A1, I1), 2( I2, A1, I1), 2 (I4, A1, I1), 1(I3, A1, I1),
    1( I4, A1, I1), 2 (I3, A1, I1), 1(I4, A1, I1), 1(I5, A1, I1), 10I1, 3 (I3, A1, I1),
    1(I2, A1, I1))

  C Sample Format:
   (%2d%2d%2d%2d%4d%4d%4d%1s%1d%4d%1s%1d%4d%1s%1d%4d%1s%1d%4d%1s%1d%4d%1s
    %1d%4d%1s%1d%2d%1s%1d%2d%1s%1d%4d%1s%1d%4d%1s%1d%3d%1s%1d%4d%1s%1d%3d
    %1s%1d%3d%1s%1d%4d%1s%1d%5ld%1s%1d%1d%1d%1d%1d%1d%1d%1d%1d%1d%1d%3d%1s
    %1d%3d%1s%1d%3d%1s%1d%2d%1s%1d)

  Note: For ceiling height data, integer variable should accept data values as large as 99999.


http://www.nrel.gov/rredc