Table 1-1. TMY2 Data Elements and Their Degree of Completeness

ElementData Completeness
Class AClass B
Extraterrestrial Horizontal Radiation 1 1
Extraterrestrial Direct Normal Radiation11
Global Horizontal Radiation 1 1
Direct Normal Radiation 1 1
Diffuse Horizontal Radiation 1 1
Global Horizontal Illuminance 1 1
Direct Normal Illuminance 1 1
Diffuse Horizontal Illuminance 1 1
Zenith Luminance 1 1
Total Sky Cover 11
Opaque Sky Cover 1 1
Dry Bulb Temperature 1 1
Dew Point Temperature 1 1
Relative Humidity 1 1
Atmospheric Pressure 1 1
Wind Direction 1 1
Wind Speed1 1
Horizontal Visibility 2 2, 3, 4
Ceiling Height 2 2, 3, 4
Present Weather2 2, 3, 4
Precipitable Water 1 1
Broadband Aerosol Optical Depth 1 1
Snow Depth 1 5
Days Since Last Snowfall 1 5
Notes:
1. Serially complete, no missing data.
2. Data may be present only every third hour.
3. Nighttime data may be missing.
4. Data may be missing for up to 47 hours.
5. Serially complete, except for Colorado Springs, CO.



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