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Average Weather in July at Denver International Airport Colorado, United States

At Denver International Airport, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 88°F throughout the month, rarely exceeding 97°F or dropping below 77°F. The highest daily average high temperature is 88°F on July 15.

Daily low temperatures increase by 4°F, from 58°F to 62°F, rarely falling below 50°F or exceeding 68°F. The highest daily average low temperature is 62°F on July 28.

For reference, on July 13, the hottest day of the year, temperatures at Denver International Airport typically range from 61°F to 88°F, while on December 30, the coldest day of the year, they range from 20°F to 42°F.

Average High and Low Temperature in July

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in July

Average Hourly Temperature in July at Denver International Airport12 AM4 AM8 AM12 PM4 PM8 PM12 AM181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131JunAugcoldcoolcomfortablewarmhot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

The month of July at Denver International Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 26% to 31%. The lowest chance of overcast or mostly cloudy conditions is 26% on July 2.

The clearest day of the month is July 2, with clear, mostly clear, or partly cloudy conditions 74% of the time.

For reference, on March 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover in July

The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Denver International Airport, the chance of a wet day over the course of July is increasing, starting the month at 22% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 29% on July 22, and its lowest chance is 5% on December 19.

Probability of Precipitation in July

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during July at Denver International Airport is gradually increasing, starting the month at 1.3 inches, when it rarely exceeds 2.4 inches or falls below 0.4 inches, and ending the month at 1.6 inches, when it rarely exceeds 2.9 inches or falls below 0.5 inches.

Average Monthly Rainfall in July

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

Over the course of July at Denver International Airport, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 41 minutes, implying an average daily decrease of 1 minute, 22 seconds, and weekly decrease of 9 minutes, 31 seconds.

The shortest day of the month is July 31, with 14 hours, 16 minutes of daylight and the longest day is July 1, with 14 hours, 57 minutes of daylight.

Hours of Daylight and Twilight in July

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month at Denver International Airport is 5:34 AM on July 1 and the latest sunrise is 23 minutes later at 5:56 AM on July 31.

The latest sunset is 8:30 PM on July 1 and the earliest sunset is 18 minutes earlier at 8:12 PM on July 31.

Daylight saving time is observed at Denver International Airport during 2017, but it neither starts nor ends during July, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:30 AM and sets 15 hours, 0 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 21 minutes later, at 4:37 PM.

Sunrise & Sunset with Twilight in July

The solar day over the course of July. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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 chance that a given day will be muggy at Denver International Airport is essentially constant during July, remaining around 0% throughout.

For reference, on July 24, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the leasy muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in July

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 at Denver International Airport is essentially constant during July, remaining within 0.1 miles per hour of 3.9 miles per hour throughout.

For reference, on April 1, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 19, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.

Average Wind Speed in July

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction at Denver International Airport during July is predominantly out of the west from July 1 to July 9 and the east from July 9 to July 31.

Wind Direction in July

Wind Direction in July at Denver International AirportWEW0%20%40%60%80%100%181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131JunAugwesteastnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Solar Energy

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 at Denver International Airport is gradually decreasing during July, falling by 0.9 kWh, from 8.0 kWh to 7.1 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in July

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Denver International Airport are 39.859 deg latitude, -104.673 deg longitude, and 5,335 ft elevation.

The topography within 2 miles of Denver International Airport contains only modest variations in elevation, with a maximum elevation change of 210 feet and an average elevation above sea level of 5,342 feet. Within 10 miles contains only modest variations in elevation (682 feet). Within 50 miles contains significant variations in elevation (7,356 feet).

The area within 2 miles of Denver International Airport is covered by shrubs (92%), within 10 miles by shrubs (37%) and grassland (34%), and within 50 miles by grassland (45%) and cropland (21%).

Data Sources

This report illustrates the typical weather at Denver International Airport year round, 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

Denver International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Buckley Air Force Base; Denver / Stapleton International, Co.; Arapahoe County Airport; Erie Municipal; Rocky Mountain Metropolitan Airport; Boulder Municipal Airport; Greeley-Weld County Airport; and Vance Brand Airport.

Other Data

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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.