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Climate and Average Weather Year Round in Denver Colorado, United States

In Denver, the summers are hot, the winters are very cold and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 22°F to 89°F and is rarely below 6°F or above 96°F.

Based on the tourism score, the best time of year to visit Denver for warm-weather activities is from mid June to early September.

Climate in Denver

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow75%75%53%53%clearovercastprecipitation: 1.9 inprecipitation: 1.9 in0.3 in0.3 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.0tourism score: 7.00.40.4
Denver weather by month. Click on each chart for more information.

The hot season lasts for 3.2 months, from June 7 to September 14, with an average daily high temperature above 80°F. The hottest month of the year in Denver is July, with an average high of 88°F and low of 62°F.

The cold season lasts for 3.5 months, from November 19 to March 2, with an average daily high temperature below 53°F. The coldest month of the year in Denver is December, with an average low of 23°F and high of 46°F.

Average High and Low Temperature in Denver

Average High and Low Temperature in DenverhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 3044°FDec 3044°FJul 1089°FJul 1089°F22°F22°F62°F62°FJun 780°FJun 780°FSep 1480°FSep 1480°FMar 253°FMar 253°F54°F54°F53°F53°F30°F30°F29°F29°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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High46°F49°F57°F64°F72°F83°F88°F86°F79°F67°F54°F46°F
Temp.33°F35°F43°F50°F59°F70°F75°F73°F65°F52°F41°F32°F
Low23°F26°F32°F39°F47°F57°F62°F60°F52°F41°F31°F23°F

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 in Denver

Average Hourly Temperature in DenverJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablecomfortablewarmhotfreezing
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.

Kırıkkale, Turkey (6,354 miles away) is the far-away foreign place with temperatures most similar to Denver (view comparison).

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Marker
© Esri, et al.

Compare Denver to another city:

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In Denver, 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 Denver begins around June 3 and lasts for 5.0 months, ending around November 2.

The clearest month of the year in Denver is September, during which on average the sky is clear, mostly clear, or partly cloudy 74% of the time.

The cloudier part of the year begins around November 2 and lasts for 7.0 months, ending around June 3.

The cloudiest month of the year in Denver is March, during which on average the sky is overcast or mostly cloudy 46% of the time.

Cloud Cover Categories in Denver

Cloud Cover Categories in DenverclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1375%Sep 1375%Mar 1553%Mar 1553%Jun 364%Jun 364%Nov 264%Nov 264%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier41%44%46%46%43%30%30%32%26%31%39%41%
Clearer59%56%54%54%57%70%70%68%74%69%61%59%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Denver varies throughout the year.

The wetter season lasts 5.2 months, from April 1 to September 7, with a greater than 18% chance of a given day being a wet day. The month with the most wet days in Denver is July, with an average of 8.6 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from September 7 to April 1. The month with the fewest wet days in Denver is December, with an average of 2.0 days with at least 0.04 inches of precipitation.

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 in Denver changes throughout the year.

Rain alone is the most common for 9.1 months, from February 17 to November 21. The month with the most days of rain alone in Denver is July, with an average of 8.6 days.

Snow alone is the most common for 2.9 months, from November 21 to February 17. The month with the most days of snow alone in Denver is January, with an average of 1.2 days.

Daily Chance of Precipitation in Denver

Daily Chance of Precipitation in DenversnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 2231%Jul 2231%Dec 196%Dec 196%Feb 178%Feb 178%Apr 118%Apr 118%Sep 718%Sep 718%NowNowrainsnowmixed
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain0.5d0.8d2.5d5.4d8.1d6.9d8.6d8.0d4.7d2.9d1.2d0.4d
Mixed1.2d0.9d0.6d0.2d0.0d0.0d0.0d0.0d0.0d0.2d0.8d1.1d
Snow0.4d0.6d1.1d0.9d0.1d0.0d0.0d0.0d0.1d0.6d0.9d0.4d
Any2.1d2.3d4.2d6.5d8.2d6.9d8.6d8.0d4.8d3.7d3.0d2.0d

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 of the year. Denver experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from March 7 to October 31, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Denver is May, with an average rainfall of 1.9 inches.

The rainless period of the year lasts for 4.3 months, from October 31 to March 7. The month with the least rain in Denver is January, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Denver

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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall0.1″0.2″0.6″1.3″1.9″1.4″1.5″1.4″1.0″0.6″0.3″0.1″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Denver experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.2 months, from October 13 to April 20, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Denver is December, with an average snowfall of 2.4 inches.

The snowless period of the year lasts for 5.8 months, from April 20 to October 13. The least snow falls around July 20, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Denver

Average Monthly Snowfall in DenversnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inDec 162.4 inDec 162.4 inJul 200.0 inJul 200.0 inMar 192.1 inMar 192.1 inJan 231.8 inJan 231.8 inOct 131.0 inOct 131.0 inNowNow
The average snowfall (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 rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall1.8″1.9″2.1″1.3″0.1″0.0″0.0″0.0″0.1″1.2″2.1″2.4″

The length of the day in Denver varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 21 minutes of daylight; the longest day is June 20, with 14 hours, 59 minutes of daylight.

Hours of Daylight and Twilight in Denver

Hours of Daylight and Twilight in DenverJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 59 minJun 2014 hr, 59 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 21 minDec 219 hr, 21 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight9.7h10.8h12.0h13.3h14.4h14.9h14.6h13.6h12.4h11.1h10.0h9.4h

The earliest sunrise is at 5:31 AM on June 13, and the latest sunrise is 2 hours, 3 minutes later at 7:34 AM on November 6. The earliest sunset is at 4:35 PM on December 7, and the latest sunset is 3 hours, 57 minutes later at 8:32 PM on June 27.

Daylight saving time (DST) is observed in Denver during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

Sunrise & Sunset with Twilight and Daylight Saving Time in Denver

Sunrise & Sunset with Twilight and Daylight Saving Time in DenverJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:31 AMJun 135:31 AM8:32 PMJun 278:32 PMJun 27Dec 74:35 PMDec 74:35 PM7:34 AMNov 67:34 AMNov 6Mar 14DSTMar 14DSTDSTNov 7DSTNov 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2021. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of key lunar data for 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.

Moon Rise, Set & Phases in Denver

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.

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 Denver, 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 in Denver

Humidity Comfort Levels in DenverJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 210%Feb 210%Jul 240%Jul 240%NowNowdrydry
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Denver experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from November 19 to April 30, with average wind speeds of more than 8.3 miles per hour. The windiest month of the year in Denver is January, with an average hourly wind speed of 9.5 miles per hour.

The calmer time of year lasts for 6.6 months, from April 30 to November 19. The calmest month of the year in Denver is August, with an average hourly wind speed of 7.0 miles per hour.

Average Wind Speed in Denver

Average Wind Speed in DenverwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphJan 179.7 mphJan 179.7 mphAug 196.9 mphAug 196.9 mphNov 198.3 mphNov 198.3 mphApr 308.3 mphApr 308.3 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph)9.59.29.18.97.97.57.37.07.37.68.28.9

The predominant average hourly wind direction in Denver is from the west throughout the year.

Wind Direction in Denver

Wind Direction in DenverJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
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).

To characterize how pleasant the weather is in Denver throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Denver for general outdoor tourist activities is from mid June to early September, with a peak score in the first week of July.

Tourism Score in Denver

Tourism Score in Denverbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.07.00.40.47.07.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Denver for hot-weather activities is from late June to mid August, with a peak score in the second week of July.

Beach/Pool Score in Denver

Beach/Pool Score in Denverbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.05.00.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Denver typically lasts for 5.5 months (169 days), from around April 27 to around October 13, rarely starting before April 6 or after May 15, and rarely ending before September 23 or after November 2.

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

Time Spent in Various Temperature Bands and the Growing Season in Denvergrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Apr 2750%Apr 2750%Oct 1350%Oct 1350%May 1590%May 1590%Sep 2390%Sep 2390%Apr 610%Apr 610%Nov 210%Nov 210%0%Feb 90%Feb 9Jul 21100%Jul 21100%NowNowfreezingvery coldcoldcoolcomfortablewarmhotfrigid
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.

Based on growing degree days alone, the first spring blooms in Denver should appear around March 19, only rarely appearing before March 2 or after April 8.

Growing Degree Days in Denver

Growing Degree Days in DenverJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FMar 1988°FMar 1988°FJun 18900°FJun 18900°FJul 261,800°FJul 261,800°FDec 313,337°FDec 313,337°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.8 months, from May 9 to August 3, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest month of the year in Denver is June, with an average of 7.8 kWh.

The darker period of the year lasts for 3.2 months, from November 3 to February 10, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest month of the year in Denver is December, with an average of 2.5 kWh.

Average Daily Incident Shortwave Solar Energy in Denver

Average Daily Incident Shortwave Solar Energy in DenverbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 217.9 kWhJun 217.9 kWhDec 212.4 kWhDec 212.4 kWhMay 96.8 kWhMay 96.8 kWhAug 36.8 kWhAug 36.8 kWhNov 33.5 kWhNov 33.5 kWhFeb 103.5 kWhFeb 103.5 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh)2.83.85.16.27.17.87.46.55.74.33.12.5

For the purposes of this report, the geographical coordinates of Denver are 39.739 deg latitude, -104.985 deg longitude, and 5,272 ft elevation.

The topography within 2 miles of Denver contains only modest variations in elevation, with a maximum elevation change of 243 feet and an average elevation above sea level of 5,248 feet. Within 10 miles contains only modest variations in elevation (1,562 feet). Within 50 miles contains very significant variations in elevation (9,649 feet).

The area within 2 miles of Denver is covered by shrubs (60%) and artificial surfaces (38%), within 10 miles by artificial surfaces (61%) and shrubs (32%), and within 50 miles by grassland (33%) and trees (28%).

This report illustrates the typical weather in Denver, 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 Denver.

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

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Denver and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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.