Average Weather in July in Southglenn Colorado, United States
In Southglenn, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 87°F throughout the month, rarely exceeding 95°F or dropping below 77°F. The highest daily average high temperature is 87°F on July 13.
Daily low temperatures increase by 2°F, from 59°F to 61°F, rarely falling below 53°F or exceeding 67°F. The highest daily average low temperature is 62°F on July 21.
For reference, on July 10, the hottest day of the year, temperatures in Southglenn typically range from 61°F to 87°F, while on December 30, the coldest day of the year, they range from 22°F to 43°F.
Average High and Low Temperature in July
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
The month of July in Southglenn experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 27% to 33%. The lowest chance of overcast or mostly cloudy conditions is 27% on July 2.
The clearest day of the month is July 2, with clear, mostly clear, or partly cloudy conditions 73% of the time.
For reference, on May 7, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on September 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.
Cloud Cover Categories in July
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Southglenn, the chance of a wet day over the course of July is rapidly increasing, starting the month at 23% and ending it at 31%.
For reference, the year's highest daily chance of a wet day is 32% on August 4, and its lowest chance is 5% on December 19.
Probability of Precipitation in July
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 in Southglenn is gradually increasing, starting the month at 1.4 inches, when it rarely exceeds 2.6 inches or falls below 0.4 inches, and ending the month at 1.7 inches, when it rarely exceeds 3.3 inches or falls below 0.6 inches.
The highest average 31-day accumulation is 1.7 inches on July 30.
Average Monthly Rainfall in July
Over the course of July in Southglenn, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 40 minutes, implying an average daily decrease of 1 minute, 21 seconds, and weekly decrease of 9 minutes, 25 seconds.
The shortest day of the month is July 31, with 14 hours, 15 minutes of daylight and the longest day is July 1, with 14 hours, 55 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Southglenn is 5:36 AM on July 1 and the latest sunrise is 22 minutes later at 5:58 AM on July 31.
The latest sunset is 8:31 PM on July 1 and the earliest sunset is 18 minutes earlier at 8:13 PM on July 31.
Daylight saving time is observed in Southglenn 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 5:32 AM and sets 14 hours, 58 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:17 AM and sets 9 hours, 22 minutes later, at 4:39 PM.
Sunrise & Sunset with Twilight in July
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 in Southglenn is essentially constant during July, remaining around 0% throughout.
For reference, on July 15, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in July
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 Southglenn is essentially constant during July, remaining within 0.1 miles per hour of 7.5 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on August 19, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.
Average Wind Speed in July
Wind Direction in July
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 in Southglenn typically lasts for 5.4 months (164 days), from around April 30 to around October 11, rarely starting before April 9 or after May 18, and rarely ending before September 20 or after November 1.
The month of July in Southglenn is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
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 in Southglenn are rapidly increasing during July, increasing by 677°F, from 1,049°F to 1,726°F, over the course of the month.
Growing Degree Days in July
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 in Southglenn is gradually decreasing during July, falling by 0.9 kWh, from 7.9 kWh to 6.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Southglenn are 39.587 deg latitude, -104.953 deg longitude, and 5,594 ft elevation.
The topography within 2 miles of Southglenn contains only modest variations in elevation, with a maximum elevation change of 387 feet and an average elevation above sea level of 5,605 feet. Within 10 miles contains only modest variations in elevation (1,473 feet). Within 50 miles contains very significant variations in elevation (9,505 feet).
The area within 2 miles of Southglenn is covered by artificial surfaces (90%), within 10 miles by artificial surfaces (48%) and shrubs (29%), and within 50 miles by grassland (36%) and trees (28%).
This report illustrates the typical weather in Southglenn 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
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Southglenn.
For each station, the records are corrected for the elevation difference between that station and Southglenn 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 Southglenn is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Southglenn and a given station.
The stations contributing to this reconstruction are: Arapahoe County Airport (68%, 9 kilometers, east); Denver / Stapleton International, Co. (30%, 20 kilometers, north); Wilkerson Pass (1.2%, 77 kilometers, southwest); and Copper Mountain, Red Cliff Pass (0.9%, 104 kilometers, west).
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.
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.