| Field Position | Element | Values | Definition |
|---|---|---|---|
| 002 - 012 002 - 003 005 - 006 008 - 009 011 - 012 | Local Standard Time Year Month Day Hour | 61 - 90 1 - 12 1 - 31 1 - 24 | Year of observation Month of observation Day of month Hour of day in local standard time |
| 014 - 017 | 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. |
| 019 - 022 | 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. |
| 024 - 030 024 - 027 029 030 | Global Horizontal Radiation Data Value Flag for Data Source Flag for Data Uncertainty | 0 - 1415 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. 9999 = missing data. |
| 032 - 038 032 - 035 037 038 | Direct Normal Radiation Data Value Flag for Data Source Flag for Data Uncertainty | 0 - 1415 A - H, ? 0 - 9 | Amount of solar radiation in Wh/m2 received
within a 5.7o field of view centered on the sun, during the 60 minutes preceding the hour indicated. 9999 = missing data. |
| 040 - 046 040 - 043 045 046 | Diffuse Horizontal Radiation Data Value Flag for Data Source Flag for Data Uncertainty | 0 - 1415 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. 9999 = missing data. |
| 048 - 049 | Total Sky Cover | 0 - 10 | Amount of sky dome (in tenths) covered by
clouds. 99 = missing data. |
| 051 - 052 | Opaque Sky Cover | 0 - 10 | Amount of sky dome (in tenths) covered by
clouds that prevent observing the sky or higher cloud layers. 99 = missing data. |
| 054 - 058 | Dry Bulb Temperature | -70.0 to 60.0 | Dry bulb temperature in oC.
9999. = missing data. |
| 060 - 064 | Dew Point Temperature | -70.0 to 60.0 | Dew point temperature in oC.
9999. = missing data. |
| 066 - 068 | Relative Humidity | 0 - 100 | Relative humidity in percent.
999 = missing data. |
| 070 - 073 | Atmospheric Pressure | 700 - 1100 | Atmospheric pressure in millibars.
9999 = missing data. |
| 075 - 077 | Wind Direction | 0 - 360 | Wind direction in degrees.
(N = 0 or 360, E = 90, S = 180, W = 270 ) 999 = missing data. |
| 078 - 082 | Wind Speed | 0.0 - 99.0 | Wind speed in m/s. 9999. = missing data. |
| 083 - 088 | Visibility | 0.0 - 160.9 | Horizontal visibility in kilometers.
777.7 = unlimited visibility. 99999.= missing data. |
| 089 - 094 | Ceiling Height | 0 - 30450 | Ceiling height in meters.
77777 = unlimited ceiling height. 88888 = cirroform. 999999 = missing data. |
| 096 - 105 | Present Weather | See Appendix D | Present weather conditions denoted by a ten digit number.
See Appendix D for an explanation of weather elements and parameters. |
| 106 - 109 | Precipitable Water | 0 -100 | Precipitable water in millimeters. 9999 = missing data. |
| 110 - 115 | Broadband Aerosol Optical Depth | 0.0 - 0.900 | Broadband aerosol optical depth (broadband turbidity ) on
the day indicated. 99999. = missing data. |
| 116 - 119 | Snow Depth | 0 - 100 | Snow depth in centimeters on the day indicated.
9999 = missing data. |
| 120 - 122 | Days Since Last Snowfall | 0 - 88 | Number of days since last snowfall. 88 = 88 or greater days. 999 = missing data. |
| FORTRAN Format
(4(1X,I2),2(lX,I4),3(1X,I4,lX,Al,I1),2(1X,I2),2(1X,F5.1),1X,I3,1X,I4,lX,I3,F5.1,F6.1,I6,1X,10I1,I4, F6.3,I4,3I3) | |||
Notes: With the exception of solar radiation elements,
broadband aerosol optical depths, snow
depth,and days since last snowfall, all values
were observed or measured at the hour
indicated. Daily values of broadband aerosol optical
depth were estimated as
described in
Section 5.2.3.