Weather

---

title: weather ---

• wd_sunupf, wd_slAzm, wd_slAlt MUST BE BEFORE wd_db
• wd_db assumed 1st non-solar geometry mbr
• re preservation of solar geometry info, see Copy()

Name	Type	Variability	Description/Comments
sunupf	number	Start of hour	fraction of hour if sun is up solar position at midpoint of hour (or portion of hour sun is up)
slAzm	number	Start of hour	azimuth, radians (0=N, +clockwise)
slAlt	number	Start of hour	altitude, radians (0=horizon, +upwards)

Name	Type	Variability	Description/Comments
db	number	Start of hour	air dry bulb temp, deg F
wb	number	Start of hour	air wet bulb temp, deg F

Name	Type	Variability	Description/Comments
DNI	number	Start of hour	direct normal irradiance from weather file (integrated value for hour, Btu/ft2)
DHI	number	Start of hour	diffuse horizontal irradiance from weather file (integrated value for hour, Btu/ft2)
bmrad	number	Start of hour	DNI as adjusted per anisotropic sky, Top.radBeamF, etc (integrated value for hour, Btu/ft2)
dfrad	number	Start of hour	DHI as adjusted per anisotropic sky, Top.radDiffF, etc (integrated value for hour, Btu/ft2)

Name	Type	Variability	Description/Comments
wndDir	number	Start of hour	wind direction, deg, 0=N, 90=E
wndSpd	number	Start of hour	wind speed, mph

Name	Type	Variability	Description/Comments
glrad	number	Start of hour	global irradiance on horizontal surface, for daylighting calculations
cldCvr	number	Start of hour	total cloud cover in tenths, 0-11, or 15 for missing data

Name	Type	Variability	Description/Comments
irHoriz	number	Start of hour	horizontal infrared sky radiation (integrated value for hour, Btu/ft2) available for epw files only used to calc Top.tSkyHr iff Top.[skyModelLW][skymodellw] == C_SKYMODLWCH_IRHORIZ
tSky	number	Start of hour	default sky temperature, F from weather file or CalcSkyTemp() (Berdahl-Martin) Note: Top.tSkyHr alternative value per Top.[skyModelLW][skymodellw]
tGrnd	number	Start of hour	ground temperature, F
taDp	number	Start of hour	air dew point temp, F
tMains	number	Start of hour	cold water mains temp, F computed using CEC ACM method

• time-of-day fuel values, units = TDV/Btu
• values are read from optional TDV file

Name	Type	Variability	Description/Comments
tdvElec	number	Start of hour	electricity
tdvFuel	number	Start of hour	fuel

• derived (computed) drybulb temp values
• values updated at standard time day beg / same all day
• *except* wd_taDbMin and wd_taDbMax are updated at hr=23 iff DST

Name	Type	Variability	Description/Comments
taDbMin	number	Start of hour	current day minimum DB (includes future hours), F updated at hr=23 iff DST
taDbAvg	number	Start of hour	current day average DB (includes future hours), F
taDbMax	number	Start of hour	current day peak DB (includes future hours), F updated at hr=23 iff DST
taDbPvMax	number	Start of hour	previous-day max DB, F
taDbAvg01	number	Start of hour	previous-day avg DB (not including current day), F
taDbAvg07	number	Start of hour	trailing 7-day avg DB (not including current day), F
taDbAvg14	number	Start of hour	trailing 14-day avg DB (not including current day), F
taDbAvg31	number	Start of hour	trailing 31-day avg DB (not including current day), F

• derived (computed) electricity TDV values
• values updated at standard time day beg / same all day
• *except* at hr=23 iff DST

Name	Type	Variability	Description/Comments
tdvElecPk	number	Start of hour	current day peak TDVelec (includes future hours) updated at hr=23 iff DST
tdvElecPkRank	number	Start of hour	current day wd_tdvElecPk rank within year (1-365/366) (largest wd_tdvElecPk=1, next=2, etc.)
tdvElecAvg	number	Start of hour	current day avg TDVelec (includes future hours)
tdvElecPvPk	number	Start of hour	previous-day peak TDVelec
tdvElecAvg01	number	Start of hour	previous-day avg TDVelec (not including current day) NOTE: code assumes wd_tdvElecAvg01 is last float
tdvElecHrRank[index]	number Array [25]	Start of hour	hour ranking of TDV values for current day hour values reflect DST status for current day [ 0]=unused [ 1]=hour of highest tdvElec, 1-24 [ 2]=hour of 2nd highest etc