Standard names for column headers for epw files are, in order:

Year,

Month,

Day,

Hour,

Datasource,

DryBulb {C},

DewPoint {C},

RelHum {%},

Atmos Pressure {Pa},

ExtHorzRad {Wh/m2},

ExtDirRad {Wh/m2},

HorzIRSky {Wh/m2},

GloHorzRad {Wh/m2},

DirNormRad {Wh/m2},

DifHorzRad {Wh/m2},

GloHorzIllum {lux},

DirNormIllum {lux},

DifHorzIllum {lux},

ZenLum {Cd/m2},

WindDir {deg},

WindSpd {m/s},

TotSkyCvr {.1},

OpaqSkyCvr {.1},

Visibility {km},

Ceiling Hgt {m},

PresWeathObs,

PresWeathCodes,

Precip Wtr {mm},

Aerosol Opt Depth {.001},

SnowDepth {cm},

Days Since Last Snow,

Albedo {.01},

Rain {mm},

Rain Quantity {hr}

Those in the file given do not seem to deviate from these, based on the orders of magnitude in each column. Obviously beware of missing values (which are typically a slew of 9s).

For Kieran Hunt. Thank You very much!