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Average Weather in July at Grand Canyon National Park Airport Arizona, United States

At Grand Canyon National Park Airport, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 84°F throughout the month, rarely exceeding 91°F or dropping below 76°F. The highest daily average high temperature is 85°F on July 5.

Daily low temperatures increase by 6°F, from 46°F to 52°F, rarely falling below 38°F or exceeding 58°F. The highest daily average low temperature is 52°F on July 30.

For reference, on July 4, the hottest day of the year, temperatures at Grand Canyon National Park Airport typically range from 47°F to 85°F, while on January 4, the coldest day of the year, they range from 16°F to 43°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 Grand Canyon National Park Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJunAugvery coldcoldcoolwarmcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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 Grand Canyon National Park Airport experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 21% to 32%. The highest chance of overcast or mostly cloudy conditions is 32% on July 30.

The clearest day of the month is July 1, with clear, mostly clear, or partly cloudy conditions 79% of the time.

For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on September 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.

Cloud Cover Categories in July

Cloud Cover Categories in July at Grand Canyon National Park Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugSep 1984%Sep 1984%Jul 179%Jul 179%Jul 3168%Jul 3168%Jul 1174%Jul 1174%Jul 2168%Jul 2168%partly cloudymostly cloudyclearovercastmostly clear
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 Grand Canyon National Park Airport, the chance of a wet day over the course of July is very rapidly increasing, starting the month at 12% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 28% on August 4, and its lowest chance is 4% on June 15.

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 Grand Canyon National Park Airport is increasing, starting the month at 0.6 inches, when it rarely exceeds 1.2 inches or falls below 0.1 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.2 inches or falls below 0.4 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 Grand Canyon National Park Airport, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 35 minutes, implying an average daily decrease of 1 minute, 10 seconds, and weekly decrease of 8 minutes, 10 seconds.

The shortest day of the month is July 31, with 13 hours, 58 minutes of daylight and the longest day is July 1, with 14 hours, 33 minutes of daylight.

Hours of Daylight and Twilight in July

Hours of Daylight and Twilight in July at Grand Canyon National Park Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJunAugnightnightdaydayJul 114 hr, 33 minJul 114 hr, 33 minJul 3113 hr, 58 minJul 3113 hr, 58 minJul 1614 hr, 20 minJul 1614 hr, 20 min
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 Grand Canyon National Park Airport is 5:15 AM on July 1 and the latest sunrise is 20 minutes later at 5:35 AM on July 31.

The latest sunset is 7:49 PM on July 1 and the earliest sunset is 15 minutes earlier at 7:33 PM on July 31.

Daylight saving time is not observed at Grand Canyon National Park Airport during 2017.

For reference, on June 21, the longest day of the year, the Sun rises at 5:12 AM and sets 14 hours, 36 minutes later, at 7:48 PM, while on December 21, the shortest day of the year, it rises at 7:35 AM and sets 9 hours, 43 minutes later, at 5:18 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 Grand Canyon National Park Airport is essentially constant during July, remaining around 0% throughout.

Humidity Comfort Levels in July

Humidity Comfort Levels in July at Grand Canyon National Park Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%JunAugJul 10%Jul 10%Jul 310%Jul 310%Jul 110%Jul 110%Jul 210%Jul 210%drydrycomfortablecomfortable
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 Grand Canyon National Park Airport is decreasing during July, decreasing from 8.1 miles per hour to 6.3 miles per hour over the course of the month.

For reference, on April 10, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 6.1 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 hourly average wind direction at Grand Canyon National Park Airport throughout July is predominantly from the west, with a peak proportion of 57% on July 14.

Wind Direction in July

Wind Direction in July at Grand Canyon National Park Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugwestsoutheastnorth
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).

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Grand Canyon National Park Airport typically lasts for 3.4 months (105 days), from around June 13 to around September 26, rarely starting before May 25 or after July 1, and rarely ending before September 8 or after October 15.

The month of July at Grand Canyon National Park Airport is very likely fully within the growing season, with the chance that a given day is in the growing season gradually increasing from 90% to 100% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in July

Time Spent in Various Temperature Bands and the Growing Season in July at Grand Canyon National Park Airportgrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug90%Jul 190%Jul 1100%Jul 31100%Jul 3198%Jul 1198%Jul 11100%Jul 21100%Jul 2150%Jun 1350%Jun 13coldcoolcomfortablehotwarmvery coldfreezing
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Grand Canyon National Park Airport is rapidly increasing during July, increasing by 531°F, from 868°F to 1,399°F, over the course of the month.

Growing Degree Days in July

The average growing degree days accumulated over the course of July, with 25th to 75th and 10th to 90th percentile bands.

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 Grand Canyon National Park Airport is decreasing during July, falling by 1.3 kWh, from 8.3 kWh to 6.9 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in July

Average Daily Incident Shortwave Solar Energy in July at Grand Canyon National Park Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJunAugJul 18.3 kWhJul 18.3 kWhJul 316.9 kWhJul 316.9 kWhJul 117.7 kWhJul 117.7 kWhJul 217.2 kWhJul 217.2 kWh
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 Grand Canyon National Park Airport are 35.952 deg latitude, -112.147 deg longitude, and 6,611 ft elevation.

The topography within 2 miles of Grand Canyon National Park Airport contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 6,617 feet. Within 10 miles contains only modest variations in elevation (4,892 feet). Within 50 miles also contains extreme variations in elevation (10,850 feet).

The area within 2 miles of Grand Canyon National Park Airport is covered by trees (78%) and shrubs (22%), within 10 miles by trees (63%) and shrubs (35%), and within 50 miles by shrubs (73%) and trees (22%).

Data Sources

This report illustrates the typical weather at Grand Canyon National Park 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

Grand Canyon National Park 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 are H.A. Clark Memorial Field, Flagstaff Pulliam Airport, Sedona Airport, Page Municipal Airport, Ernest A. Love Field, Winslow Municipal Airport, and Kingman 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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.