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index A pandas datetime index. NOTE, times are set to local standard time (daylight savings is not included). Days run from 0-23h to comply with PVLIB's convention
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year Year, from original EPW file. Can be overwritten using coerce function.
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month Month, from original EPW file
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day Day of the month, from original EPW file.
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hour Hour of the day from original EPW file. Note that EPW's convention of 1-24h is not taken over in the index dataframe used in PVLIB.
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minute Minute, from original EPW file. Not used.
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data_source_unct Data source and uncertainty flags. See [1]_, chapter 2.13
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temp_air Dry bulb temperature at the time indicated, deg C
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temp_dew Dew-point temperature at the time indicated, deg C
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relative_humidity Relatitudeive humidity at the time indicated, percent
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atmospheric_pressure Station pressure at the time indicated, Pa
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etr Extraterrestrial horizontal radiation recv'd during 60 minutes prior to timestamp, Wh/m^2
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etrn Extraterrestrial normal radiation recv'd during 60 minutes prior to timestamp, Wh/m^2
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ghi_infrared Horizontal infrared radiation recv'd during 60 minutes prior to timestamp, Wh/m^2
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ghi Direct and diffuse horizontal radiation recv'd during 60 minutes prior to timestamp, Wh/m^2
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dni Amount of direct normal radiation (modeled) recv'd during 60 mintues prior to timestamp, Wh/m^2
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dhi Amount of diffuse horizontal radiation recv'd during 60 minutes prior to timestamp, Wh/m^2
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global_hor_illum Avg. total horizontal illuminance recv'd during the 60 minutes prior to timestamp, lx
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direct_normal_illum Avg. direct normal illuminance recv'd during the 60 minutes prior to timestamp, lx
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diffuse_horizontal_illum Avg. horizontal diffuse illuminance recv'd during the 60 minutes prior to timestamp, lx
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zenith_luminance Avg. luminance at the sky's zenith during the 60 minutes prior to timestamp, cd/m^2
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wind_direction Wind direction at time indicated, degrees from north (360 = north; 0 = undefined,calm)
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wind_speed Wind speed at the time indicated, meter/second
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total_sky_cover Amount of sky dome covered by clouds or obscuring phenonema at time stamp, tenths of sky
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opaque_sky_cover Amount of sky dome covered by clouds or obscuring phenonema that prevent observing the sky at time stamp, tenths of sky
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visibility Horizontal visibility at the time indicated, km
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ceiling_height Height of cloud base above local terrain (7777=unlimited), meter
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present_weather_observation Indicator for remaining fields: If 0, then the observed weather codes are taken from the following field. If 9, then missing weather is assumed.
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present_weather_codes Present weather code, see [1], chapter 2.9.1.28
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precipitable_water Total precipitable water contained in a column of unit cross section from earth to top of atmosphere, cm. Note that some old *_TMY3.epw files may have incorrect unit if it was retrieved from www.energyplus.net.
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aerosol_optical_depth The broadband aerosol optical depth per unit of air mass due to extinction by aerosol component of atmosphere, unitless
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snow_depth Snow depth in centimeters on the day indicated, (999 = missing data)
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days_since_last_snowfall Number of days since last snowfall (maximum value of 88, where 88 = 88 or greater days; 99 = missing data)
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albedo The ratio of reflected solar irradiance to global horizontal irradiance, unitless
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liquid_precipitation_depth The amount of liquid precipitation observed at indicated time for the period indicated in the liquid precipitation quantity field, millimeter
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liquid_precipitation_quantity The period of accumulation for the liquid precipitation depth field, hour
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