Climate and Average Weather Year Round in Ar Rayyān QatarIn Ar Rayyān, the summers are long, sweltering, muggy, arid, and partly cloudy and the winters are comfortable, dry, windy, and mostly clear. Over the course of the year, the temperature typically varies from 56°F to 109°F and is rarely below 49°F or above 114°F. Based on the beach/pool score, the best times of year to visit Ar Rayyān for hot-weather activities are from early April to early May and from mid October to late November. Average Temperature in Ar RayyānThe hot season lasts for 4.4 months, from May 10 to September 21, with an average daily high temperature above 101°F. The hottest month of the year in Ar Rayyān is July, with an average high of 108°F and low of 87°F. The cool season lasts for 3.1 months, from December 2 to March 5, with an average daily high temperature below 79°F. The coldest month of the year in Ar Rayyān is January, with an average low of 56°F and high of 71°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. Chingueṭṭi, Mauritania (4,036 miles away) is the far-away foreign place with temperatures most similar to Ar Rayyān (view comparison). CloudsIn Ar Rayyān, 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 Ar Rayyān begins around September 6 and lasts for 6.4 months, ending around March 17. The clearest month of the year in Ar Rayyān is October, during which on average the sky is clear, mostly clear, or partly cloudy 88% of the time. The cloudier part of the year begins around March 17 and lasts for 5.6 months, ending around September 6. The cloudiest month of the year in Ar Rayyān is August, during which on average the sky is overcast or mostly cloudy 45% of the time.
PrecipitationAr Rayyān does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from -0% to 6%, with an average value of 2%. 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 Ar Rayyān is March, with an average of 1.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 6% on March 14.
RainfallTo 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. Ar Rayyān experiences some seasonal variation in monthly rainfall. Rain falls throughout the year in Ar Rayyān. The month with the most rain in Ar Rayyān is March, with an average rainfall of 0.4 inches. The month with the least rain in Ar Rayyān is July, with an average rainfall of 0.0 inches.
SunThe length of the day in Ar Rayyān varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 34 minutes of daylight; the longest day is June 20, with 13 hours, 43 minutes of daylight.
The earliest sunrise is at 4:43 AM on June 9, and the latest sunrise is 1 hour, 38 minutes later at 6:21 AM on January 13. The earliest sunset is at 4:43 PM on November 29, and the latest sunset is 1 hour, 45 minutes later at 6:28 PM on July 2. Daylight saving time (DST) is not observed in Ar Rayyān during 2024. 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. MoonThe 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. HumidityWe 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. Ar Rayyān experiences extreme seasonal variation in the perceived humidity. The muggier period of the year lasts for 6.3 months, from May 14 to November 24, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The month with the most muggy days in Ar Rayyān is August, with 24.7 days that are muggy or worse. The month with the fewest muggy days in Ar Rayyān is February, with 0.5 days that are muggy or worse.
WindThis 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 Ar Rayyān experiences significant seasonal variation over the course of the year. The windier part of the year lasts for 2.4 months, from May 6 to July 19, with average wind speeds of more than 9.2 miles per hour. The windiest month of the year in Ar Rayyān is June, with an average hourly wind speed of 10.7 miles per hour. The calmer time of year lasts for 9.6 months, from July 19 to May 6. The calmest month of the year in Ar Rayyān is September, with an average hourly wind speed of 7.6 miles per hour.
The predominant average hourly wind direction in Ar Rayyān is from the north throughout the year. Water TemperatureAr Rayyān 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 significant seasonal variation over the course of the year. The time of year with warmer water lasts for 3.5 months, from June 28 to October 11, with an average temperature above 88°F. The month of the year in Ar Rayyān with the warmest water is August, with an average temperature of 93°F. The time of year with cooler water lasts for 3.4 months, from December 21 to April 3, with an average temperature below 72°F. The month of the year in Ar Rayyān with the coolest water is February, with an average temperature of 67°F.
Best Time of Year to VisitTo characterize how pleasant the weather is in Ar Rayyān 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 Ar Rayyān for general outdoor tourist activities is from mid November to early April, with a peak score in the last week of November. Tourism Score in Ar RayyānThe beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Ar Rayyān for hot-weather activities are from early April to early May and from mid October to late November, with a peak score in the first week of November. Beach/Pool Score in Ar RayyānMethodologyFor 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. Growing SeasonDefinitions 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 Ar Rayyān 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. 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. Solar EnergyThis 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 significant seasonal variation over the course of the year. The brighter period of the year lasts for 2.6 months, from May 4 to July 22, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year in Ar Rayyān is June, with an average of 8.0 kWh. The darker period of the year lasts for 2.9 months, from November 9 to February 6, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest month of the year in Ar Rayyān is December, with an average of 4.0 kWh.
TopographyFor the purposes of this report, the geographical coordinates of Ar Rayyān are 25.292 deg latitude, 51.424 deg longitude, and 75 ft elevation. The topography within 2 miles of Ar Rayyān contains only modest variations in elevation, with a maximum elevation change of 102 feet and an average elevation above sea level of 77 feet. Within 10 miles also contains only modest variations in elevation (269 feet). Within 50 miles also contains only modest variations in elevation (479 feet). The area within 2 miles of Ar Rayyān is covered by artificial surfaces (81%) and bare soil (19%), within 10 miles by bare soil (62%) and artificial surfaces (32%), and within 50 miles by bare soil (50%) and water (48%). Data SourcesThis report illustrates the typical weather in Ar Rayyān, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Ar Rayyān. For each station, the records are corrected for the elevation difference between that station and Ar Rayyān 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 Ar Rayyān is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ar Rayyān 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 Ar Rayyān 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 DataAll 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. DisclaimerThe 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. |