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Climate and Average Weather Year Round in Altadena California, United States

In Altadena, the summers are short, hot, arid, and clear and the winters are long, cool, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 43°F to 88°F and is rarely below 36°F or above 97°F.

Based on the tourism score, the best time of year to visit Altadena for warm-weather activities is from late May to early October.

Climate in Altadena

comfortablewarmhotwarmcomfortablecoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow91%91%56%56%clearovercastprecipitation: 3.1 inprecipitation: 3.1 in0.0 in0.0 inmuggy: 1%muggy: 1%0%0%drydrytourism score: 8.3tourism score: 8.32.22.2
Altadena weather by month. Click on each chart for more information.

The hot season lasts for 2.9 months, from June 25 to September 23, with an average daily high temperature above 83°F. The hottest month of the year in Altadena is August, with an average high of 88°F and low of 65°F.

The cool season lasts for 3.8 months, from November 22 to March 17, with an average daily high temperature below 69°F. The coldest month of the year in Altadena is December, with an average low of 44°F and high of 65°F.

Average High and Low Temperature in Altadena

Average High and Low Temperature in AltadenahotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 2464°FDec 2464°FAug 2288°FAug 2288°F43°F43°F65°F65°FJun 2583°FJun 2583°FSep 2383°FSep 2383°FMar 1769°FMar 1769°F62°F62°F61°F61°F47°F47°F49°F49°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
High 65°F66°F69°F73°F76°F81°F86°F88°F85°F78°F71°F65°F
Temp. 53°F55°F57°F61°F64°F69°F74°F75°F72°F66°F58°F53°F
Low 44°F46°F49°F52°F56°F60°F64°F65°F62°F56°F49°F44°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 Altadena

Average Hourly Temperature in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowcoldcoldcoldcoldcoolcoolcomfortablewarmhotvery coldvery cold
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.

Berrechid, Morocco (5,965 miles away) is the far-away foreign place with temperatures most similar to Altadena (view comparison).

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In Altadena, 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 Altadena begins around April 23 and lasts for 6.3 months, ending around November 3.

The clearest month of the year in Altadena is August, during which on average the sky is clear, mostly clear, or partly cloudy 90% of the time.

The cloudier part of the year begins around November 3 and lasts for 5.7 months, ending around April 23.

The cloudiest month of the year in Altadena is February, during which on average the sky is overcast or mostly cloudy 43% of the time.

Cloud Cover Categories in Altadena

Cloud Cover Categories in AltadenaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 691%Sep 691%Feb 2256%Feb 2256%Apr 2373%Apr 2373%Nov 373%Nov 373%NowNowclearovercastmostly clear
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
Cloudier 40%43%36%28%22%13%11%10%11%20%31%39%
Clearer 60%57%64%72%78%87%89%90%89%80%69%61%

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

The wetter season lasts 4.3 months, from November 21 to March 29, with a greater than 10% chance of a given day being a wet day. The month with the most wet days in Altadena is February, with an average of 5.5 days with at least 0.04 inches of precipitation.

The drier season lasts 7.7 months, from March 29 to November 21. The month with the fewest wet days in Altadena is July, with an average of 0.1 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. The month with the most days of rain alone in Altadena is February, with an average of 5.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on February 19.

Daily Chance of Precipitation in Altadena

Daily Chance of Precipitation in AltadenawetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 1920%Feb 1920%Jul 10%Jul 10%Nov 2110%Nov 2110%Mar 2910%Mar 2910%NowNowrain
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
Rain 5.1d5.5d4.3d2.0d0.7d0.1d0.1d0.3d0.6d1.6d2.7d4.5d

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. Altadena experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.2 months, from October 17 to April 23, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Altadena is February, with an average rainfall of 3.1 inches.

The rainless period of the year lasts for 5.8 months, from April 23 to October 17. The month with the least rain in Altadena is July, with an average rainfall of 0.0 inches.

Average Monthly Rainfall in Altadena

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
Rainfall 2.5″3.1″1.9″0.7″0.2″0.0″0.0″0.0″0.2″0.5″0.9″2.1″

The length of the day in Altadena varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 52 minutes of daylight; the longest day is June 20, with 14 hours, 26 minutes of daylight.

Hours of Daylight and Twilight in Altadena

Hours of Daylight and Twilight in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 26 minJun 2014 hr, 26 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 52 minDec 219 hr, 52 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
Daylight 10.2h11.0h12.0h13.1h14.0h14.4h14.2h13.4h12.3h11.3h10.4h9.9h

The earliest sunrise is at 5:40 AM on June 11, and the latest sunrise is 1 hour, 34 minutes later at 7:13 AM on November 2. The earliest sunset is at 4:42 PM on December 3, and the latest sunset is 3 hours, 26 minutes later at 8:08 PM on June 29.

Daylight saving time (DST) is observed in Altadena during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Altadena

Sunrise & Sunset with Twilight and Daylight Saving Time in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 115:40 AMJun 115:40 AM8:08 PMJun 298:08 PMJun 29Dec 34:42 PMDec 34:42 PM7:13 AMNov 27:13 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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 the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Altadena

Solar Elevation and Azimuth in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM00010101010202020303030404040505060607000010101020202020303030404040505060703279NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. 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 Altadena

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 Altadena, 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, staying within 1% of 1% throughout.

Humidity Comfort Levels in Altadena

Humidity Comfort Levels in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 250%Mar 250%Aug 271%Aug 271%humidhumidcomfortablecomfortabledrydry
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 days 0.0d0.0d0.0d0.0d0.0d0.0d0.3d0.4d0.3d0.0d0.0d0.0d

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 Altadena experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from November 7 to May 3, with average wind speeds of more than 6.9 miles per hour. The windiest month of the year in Altadena is December, with an average hourly wind speed of 8.3 miles per hour.

The calmer time of year lasts for 6.1 months, from May 3 to November 7. The calmest month of the year in Altadena is August, with an average hourly wind speed of 5.4 miles per hour.

Average Wind Speed in Altadena

Average Wind Speed in AltadenawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphDec 308.6 mphDec 308.6 mphSep 55.3 mphSep 55.3 mphNov 76.9 mphNov 76.9 mphMay 36.9 mphMay 36.9 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) 8.27.77.27.26.66.05.65.45.46.17.38.3

The predominant average hourly wind direction in Altadena varies throughout the year.

The wind is most often from the west for 3.9 months, from March 4 to June 30 and for 1.5 months, from September 3 to October 17, with a peak percentage of 49% on May 21. The wind is most often from the south for 2.1 months, from June 30 to September 3, with a peak percentage of 47% on July 29. The wind is most often from the north for 4.6 months, from October 17 to March 4, with a peak percentage of 37% on January 1.

Wind Direction in Altadena

Wind Direction in AltadenaNWSWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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).

Altadena is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from July 4 to October 12, with an average temperature above 66°F. The month of the year in Altadena with the warmest water is August, with an average temperature of 68°F.

The time of year with cooler water lasts for 4.7 months, from December 9 to April 30, with an average temperature below 60°F. The month of the year in Altadena with the coolest water is February, with an average temperature of 59°F.

Average Water Temperature in Altadena

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 59°F59°F59°F60°F62°F65°F67°F68°F68°F66°F63°F60°F

To characterize how pleasant the weather is in Altadena 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 Altadena for general outdoor tourist activities is from late May to early October, with a peak score in the first week of July.

Tourism Score in Altadena

Tourism Score in Altadenabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.38.32.22.2NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Altadena for hot-weather activities is from early July to early September, with a peak score in the third week of August.

Beach/Pool Score in Altadena

Beach/Pool Score in Altadenabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.55.50.30.3NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/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).

Temperatures in Altadena are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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

Time Spent in Various Temperature Bands and the Growing Season in Altadenagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Jan 1790%Jan 1790%Dec 1890%Dec 18Jul 15100%Jul 15100%NowNowvery 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.

Growing Degree Days in Altadena

Growing Degree Days in AltadenaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FJan 1890°FJan 1890°FApr 29900°FApr 29900°FJun 251,800°FJun 251,800°FDec 314,932°FDec 314,932°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 3.9 months, from April 24 to August 19, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest month of the year in Altadena is June, with an average of 8.5 kWh.

The darker period of the year lasts for 3.2 months, from November 5 to February 12, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest month of the year in Altadena is December, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy in Altadena

Average Daily Incident Shortwave Solar Energy in AltadenabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 178.6 kWhJun 178.6 kWhDec 243.0 kWhDec 243.0 kWhApr 247.5 kWhApr 247.5 kWhAug 197.5 kWhAug 197.5 kWhNov 54.1 kWhNov 54.1 kWhFeb 124.1 kWhFeb 124.1 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) 3.34.25.77.18.08.58.27.56.45.03.73.0

For the purposes of this report, the geographical coordinates of Altadena are 34.190 deg latitude, -118.131 deg longitude, and 1,362 ft elevation.

The topography within 2 miles of Altadena contains large variations in elevation, with a maximum elevation change of 2,756 feet and an average elevation above sea level of 1,456 feet. Within 10 miles contains large variations in elevation (5,892 feet). Within 50 miles also contains extreme variations in elevation (10,062 feet).

The area within 2 miles of Altadena is covered by artificial surfaces (72%) and shrubs (27%), within 10 miles by artificial surfaces (49%) and shrubs (41%), and within 50 miles by shrubs (47%) and artificial surfaces (24%).

This report illustrates the typical weather in Altadena, 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 Altadena.

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

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.

Please review our full terms contained on our Terms of Service page.