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Utah House
Climatic Conditions


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30-Year Average Annual Data

Station: Salt Lake City, UT

Latitude (N): 40.77
Longitude (W): 111.97

Elevation (ft): 4226

Incident Solar Radiation, Global (Btu/sq.ft./day):

Horizontal: 1450
Vertical North: 390 Vertical East: 880
Vertical South: 1090
Vertical West: 860

Heating Degree Days (HDD), base 65 degrees F: 5765

Cooling Degree Days (CDD), base 65 degrees F: 1047

Temperature (degrees Fahrenheit):

Average: 52.0
Daily Minimum: 40.3
Daily Maximum: 63.6

Humidity Ratio (lb. water per lb. dry air): 0.0050

Wind Speed (mph): 9.0 Clearness Index (Kt): 0.58 * Precipitation (inches): 16.5

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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 : , 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:

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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 -
"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."

Precipitation -
Based on 30-year (1971 - 2000) Normal.

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