Average Annual Data
Station: Salt Lake City, UT
||Latitude (N): 40.77
|Longitude (W): 111.97
Elevation (ft): 4226
Incident Solar Radiation, Global
|Vertical North: 390
|Vertical South: 1090
Heating Degree Days (HDD),
base 65 degrees F: 5765
Cooling Degree Days (CDD),
base 65 degrees F: 1047
Temperature (degrees Fahrenheit):
|Daily Minimum: 40.3
|Daily Maximum: 63.6
Humidity Ratio (lb. water per lb. dry air):
Sources of information
Solar, temperature, degree day, humidity and wind was obtained from The
Solar Radiation Data Manual for Buildings, produced by the National
Renewable Energy Laboratory's (NREL's) Analytic Studies Division under
the Resource Assessment Program, which is funded and monitored by the
U.S. Department of Energy's Office of Solar Energy Conversion. For more
detailed information please visit : http://rredc.nrel.gov/solar/pubs/bluebook/
, Interpreting the Data Tables.
Precipitation data was obtained from the National Climatic Data Center,
a program of the National Atmospheric and Oceanic Administration. Select
historical data by location from: http://nndc.noaa.gov/?http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=C00115-PUB-S0001.
Definition of Terms
Incident Solar Radiation
- Global Radiation (Btu/sq.ft./day)
"Global radiation is the total radiation received by the window and
is the sum of the direct beam radiation component, sky radiation, and
radiation reflected from ground in front of the surface." Data is
provided for five windows, horizontal and north, south, east and west
facing vertical windows. The annual average is comprised of 30 years (1961
- 1990) of average annual data.
"Degree days indicate heating and cooling requirements of buildings.
They are defined as the difference between the average temperature for
the day and a base temperature [in this case 65 degrees Fahrenheit]. If
the average for the day (calculated by averaging the maximum and minimum
temperature for the day) is less than the base value, then the difference
is designated as heating degree days. If the average is greater than the
base value, the difference is designated as cooling degree days."
Clearness Index (Kt)
"The clearness index (Kt) is the station's global horizontal solar
radiation divided by its extraterrestrial horizontal radiation. Because
clouds decrease the amount of solar radiation reaching the earth, stations
in cloudy regions will have lower values for Kt than stations in regions
will fewer clouds."
Based on 30-year (1971 - 2000) Normal.