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si units

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Legend
CDDn Cooling degree-days base n°C, °C-day Lat Latitude, ° Period Years used to calculate the design conditions
Period Years used to calculate the design conditions Long Longitude, ° Sd Standard deviation of daily average temperature, °C
DB Dry bulb temperature, °C MCDB Mean coincident dry bulb temperature, °C MCDB Mean coincident dry bulb temperature, °C
DP Dew point temperature, °C MCDBR Mean coincident dry bulb temp. range, °C taub Clear sky optical depth for beam irradiance
Ebn,noon } Clear sky beam normal and diffuse horizontal irradiances at solar noon, W/m2 MCDP Mean coincident dew point temperature, °C Tavg Average temperature, °C
Elev Elevation, m MCWB Mean coincident wet bulb temperature, °C Time Zone Hours ahead or behind UTC, and time zone code
Enth Enthalpy, kJ/kg MCWBR Mean coincident wet bulb temp. range, °C WB Wet bulb temperature, °C
HDDn Heating degree-days base n°C, °C-day MCWS Mean coincident wind speed, m/s WBAN Weather Bureau Army Navy number
Hours 8/4 & 12.8/20.6 Number of hours between 8 a.m. and 4 p.m with DB between 12.8 and 20.6 °C
MDBR Mean dry bulb temp. range, °C WMO# World Meteorological Organization number
HR Humidity ratio, g of moisture per kg of dry air
 PCWD Prevailing coincident wind direction, °, 0 = North, 90 = East WS Wind speed, m/s
taud Clear sky optical depth for diffuse irradiance Stdp Standard Pressure Station Elevation, kPa