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Summer Weather in Centennial Colorado, United States

Daily high temperatures increase by 6°F, from 75°F to 82°F, rarely falling below 63°F or exceeding 94°F. The highest daily average high temperature is 86°F on July 13.

Daily low temperatures increase by 6°F, from 50°F to 56°F, rarely falling below 42°F or exceeding 66°F. The highest daily average low temperature is 61°F on July 21.

For reference, on July 10, the hottest day of the year, temperatures in Centennial typically range from 60°F to 86°F, while on December 30, the coldest day of the year, they range from 21°F to 42°F.

Average High and Low Temperature in the Summer in Centennial

Average High and Low Temperature in the Summer in CentennialJunJulAug30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°FSpringFallJul 1086°FJul 1086°F60°F60°FJun 175°FJun 175°F50°F50°FAug 3182°FAug 3182°F56°F56°FAug 185°FAug 185°F60°F60°FNowNow
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 summer temperatures. 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 the Summer in Centennial

Average Hourly Temperature in the Summer in CentennialJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallNowNowcoldcoldcoldcoolcoolcomfortablewarmcomfortablevery coldcold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ankara, Turkey (6,338 miles away) is the far-away foreign place with temperatures most similar to Centennial (view comparison).

Compare Centennial to another city:

Clouds

The summer in Centennial experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 38% to 31%.

The clearest day of the summer 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 46%, 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 the Summer in Centennial

Cloud Cover Categories in the Summer in CentennialJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallJun 162%Jun 162%Aug 3169%Aug 3169%Jul 173%Jul 173%Aug 167%Aug 167%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Centennial, the chance of a wet day over the course of the summer is gradually decreasing, starting the season at 25% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 32% on July 22, and its lowest chance is 5% on December 19.

Probability of Precipitation in the Summer in Centennial

Probability of Precipitation in the Summer in CentennialJunJulAug0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%SpringFallJul 2232%Jul 2232%Jun 125%Jun 125%Aug 3122%Aug 3122%Jul 123%Jul 123%NowNowrainmixed
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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Centennial is gradually decreasing, starting the season at 1.6 inches, when it rarely exceeds 2.8 inches or falls below 0.6 inches, and ending the season at 1.2 inches, when it rarely exceeds 2.1 inches or falls below 0.4 inches.

The highest average 31-day accumulation is 1.8 inches on July 30.

Average Monthly Rainfall in the Summer in Centennial

Average Monthly Rainfall in the Summer in CentennialJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inSpringFallJul 291.8 inJul 291.8 inJun 11.6 inJun 11.6 inAug 311.2 inAug 311.2 inJul 11.4 inJul 11.4 inNowNow
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 the summer in Centennial, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 43 minutes, implying an average daily decrease of 1 minute, 8 seconds, and weekly decrease of 7 minutes, 55 seconds.

The shortest day of the summer is August 31, with 13 hours, 4 minutes of daylight and the longest day is June 21, with 14 hours, 58 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Centennial

Hours of Daylight and Twilight in the Summer in CentennialJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2014 hr, 58 minJun 2014 hr, 58 minnightnightdaydayAug 3113 hr, 4 minAug 3113 hr, 4 minAug 114 hr, 13 minAug 114 hr, 13 minNowNow
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 summer in Centennial is 5:31 AM on June 13 and the latest sunrise is 56 minutes later at 6:27 AM on August 31.

The latest sunset is 8:31 PM on June 27 and the earliest sunset is 1 hour, 0 minutes earlier at 7:31 PM on August 31.

Daylight saving time is observed in Centennial during 2021, but it neither starts nor ends during the summer, so the entire season 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 7:16 AM and sets 9 hours, 22 minutes later, at 4:38 PM.

Sunrise & Sunset with Twilight in the Summer in Centennial

Sunrise & Sunset with Twilight in the Summer in CentennialJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:31 AM5:31 AMJun 138:28 PMJun 138:28 PM6:27 AM6:27 AMAug 317:31 PMAug 317:31 PM5:35 AM5:35 AMJul 18:30 PMJul 18:30 PM5:59 AM5:59 AMAug 18:11 PMAug 18:11 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the summer. 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.

Moon

The figure below presents a compact representation of key lunar data for the summer of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Summer in Centennial

Moon Rise, Set & Phases in the Summer in CentennialJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 111:01 PMMay 111:01 PMMay 265:15 AMMay 265:15 AMJun 104:53 AMJun 104:53 AMJun 2412:40 PMJun 2412:40 PMJul 97:17 PMJul 97:17 PMJul 238:38 PMJul 238:38 PMAug 87:51 AMAug 87:51 AMAug 226:03 AMAug 226:03 AMSep 66:52 PMSep 66:52 PMSep 205:55 PMSep 205:55 PM5:53 AM5:53 AM8:11 PM8:11 PM7:39 PM7:39 PM5:44 AM5:44 AM9:01 PM9:01 PM7:46 PM7:46 PM5:12 AM5:12 AM5:03 AM5:03 AM8:41 PM8:41 PM8:35 PM8:35 PM6:11 AM6:11 AM8:40 PM8:40 PM7:51 PM7:51 PM6:14 AM6:14 AM5:53 AM5:53 AM7:41 PM7:41 PM7:17 PM7:17 PM7:17 AM7:17 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 in Centennial is essentially constant during the summer, remaining around 0% throughout.

For reference, on July 27, 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 the Summer in Centennial

Humidity Comfort Levels in the Summer in CentennialJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallJul 270%Jul 270%Jun 10%Jun 10%Aug 310%Aug 310%Jul 10%Jul 10%NowNowdrydrycomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 in Centennial is gradually decreasing during the summer, decreasing from 8.1 miles per hour to 7.3 miles per hour over the course of the season.

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 7.2 miles per hour.

The lowest daily average wind speed during the summer is 7.2 miles per hour on August 19.

Average Wind Speed in the Summer in Centennial

Average Wind Speed in the Summer in CentennialJunJulAug0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphSpringFallAug 197.2 mphAug 197.2 mphJun 18.1 mphJun 18.1 mphJul 17.6 mphJul 17.6 mphAug 17.4 mphAug 17.4 mphNowNow
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 in Centennial throughout the summer is predominantly from the west, with a peak proportion of 36% on August 30.

Wind Direction in the Summer in Centennial

Wind Direction in the Summer in CentennialJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallNowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 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 in Centennial typically lasts for 5.1 months (157 days), from around May 3 to around October 8, rarely starting before April 14 or after May 20, and rarely ending before September 17 or after October 29.

The summer in Centennial is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Centennial

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Centennialgrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 1750%May 350%May 390%May 2090%May 2090%Sep 1790%Sep 17NowNowvery coldcoldcoolcomfortablewarmhot
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 percentage of time spent in various temperature bands. 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 in Centennial are very rapidly increasing during the summer, increasing by 1,778°F, from 492°F to 2,270°F, over the course of the season.

Growing Degree Days in the Summer in Centennial

Growing Degree Days in the Summer in CentennialJunJulAug500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FSpringFallJun 1492°FJun 1492°FAug 312,270°FAug 312,270°FJul 11,000°FJul 11,000°FAug 11,675°FAug 11,675°FNowNow
The average growing degree days accumulated over the course of the summer, 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 in Centennial is decreasing during the summer, falling by 1.4 kWh, from 7.6 kWh to 6.2 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 8.0 kWh on June 21.

Average Daily Incident Shortwave Solar Energy in the Summer in Centennial

Average Daily Incident Shortwave Solar Energy in the Summer in CentennialJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJun 218.0 kWhJun 218.0 kWhJun 17.6 kWhJun 17.6 kWhAug 316.2 kWhAug 316.2 kWhAug 16.9 kWhAug 16.9 kWhNowNow
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 Centennial are 39.579 deg latitude, -104.877 deg longitude, and 5,830 ft elevation.

The topography within 2 miles of Centennial contains only modest variations in elevation, with a maximum elevation change of 318 feet and an average elevation above sea level of 5,764 feet. Within 10 miles contains only modest variations in elevation (1,430 feet). Within 50 miles contains very significant variations in elevation (9,465 feet).

The area within 2 miles of Centennial is covered by artificial surfaces (52%) and shrubs (44%), within 10 miles by artificial surfaces (41%) and shrubs (30%), and within 50 miles by grassland (39%) and trees (26%).

Data Sources

This report illustrates the typical weather in Centennial, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Centennial.

For each station, the records are corrected for the elevation difference between that station and Centennial 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 Centennial is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Centennial and a given station.

The stations contributing to this reconstruction are: Arapahoe County Airport (KAPA, 96%, 2.6 kilometers, southeast); Denver / Stapleton International, Co. (KDNR, 4.0%, 19 kilometers, north); and Wilkerson Pass (K4BM, 0.2%, 81 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.