Average Weather in Salt Lake City Utah, United States
In Salt Lake City, the temperature typically varies from 23°F to 93°F over the course of the year, and is rarely below 10°F or above 100°F.
The hot season lasts for 3.1 months, from June 9 to September 13, with an average daily high temperature above 81°F. The hottest day of the year is July 23, with an average high of 93°F and low of 67°F.
The cold season lasts for 3.1 months, from November 22 to February 24, with an average daily high temperature below 47°F. The coldest day of the year is January 7, with an average low of 23°F and high of 36°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
The length of the day in Salt Lake City varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 15 minutes of daylight; the longest day is June 21, with 15 hours, 6 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:55 AM on June 14, and the latest sunrise is 2 hours, 6 minutes later at 8:01 AM on November 4. The earliest sunset is at 4:59 PM on December 8, and the latest sunset is 4 hours, 3 minutes later at 9:03 PM on June 26.
Daylight saving time (DST) is observed in Salt Lake City during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
In Salt Lake City, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Salt Lake City begins around May 31 and lasts for 4.8 months, ending around October 26. On August 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 21% of the time.
The cloudier part of the year begins around October 26 and lasts for 7.2 months, ending around May 31. On March 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Salt Lake City varies throughout the year.
The wetter season lasts 8.5 months, from September 20 to June 6, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 27% on April 30.
The drier season lasts 3.5 months, from June 6 to September 20. The smallest chance of a wet day is 8% on June 30.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 27% on May 3.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Salt Lake City experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Salt Lake City. The most rain falls during the 31 days centered around May 9, with an average total accumulation of 1.8 inches.
The least rain falls around July 12, with and average total accumulation of 0.5 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Salt Lake City experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.9 months, from November 13 to March 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 5, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 8.1 months, from March 11 to November 13. The least snow falls around July 27, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Salt Lake City, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.The average hourly wind speed in Salt Lake City does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 3.2 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Salt Lake City varies throughout the year.
The wind is most often from the west for 3.0 months, from March 25 to June 24, with a peak percentage of 34% on May 3. The wind is most often from the south for 9.0 months, from June 24 to March 25, with a peak percentage of 48% on December 16.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 3.0 months, from May 15 to August 15, with an average daily incident shortwave energy per square meter above 7.1 kWh. The brightest day of the year is June 29, with an average of 8.4 kWh.
The darker period of the year lasts for 3.5 months, from October 30 to February 15, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 21, with an average of 2.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Salt Lake City are 40.761 deg latitude, -111.891 deg longitude, and 4,262 ft elevation.
The topography within 2 miles of Salt Lake City contains significant variations in elevation, with a maximum elevation change of 689 feet, and an average elevation above sea level of 4,321 feet. Within 10 miles contains extreme variations in elevation (5,164 feet). Within 50 miles also contains extreme variations in elevation (7,457 feet).
The area within 2 miles of Salt Lake City is covered by artificial surfaces (66%) and shrubs (33%), within 10 miles by artificial surfaces (36%) and shrubs (32%), and within 50 miles by shrubs (41%) and trees (22%).
This report illustrates the typical weather in Salt Lake City, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Salt Lake City.
For each station, the records are corrected for the elevation difference between that station and Salt Lake City according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Salt Lake City is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Salt Lake City and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .