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Average Weather in Ra’s al ‘Ayn Syria

In Ra’s al ‘Ayn, the summers are sweltering, arid, and clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 35°F to 104°F and is rarely below 26°F or above 109°F.

Climate Summary

coldcoolwarmhotswelteringhotcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec100%100%55%55%clearovercastprecipitation: 1.2 inprecipitation: 1.2 in0.0 in0.0 inmuggy: 1%muggy: 1%0%0%drydrybeach/pool score: 8.8beach/pool score: 8.80.00.0
Click on each chart for more information.

Based on the beach/pool score, the best times of year to visit Ra’s al ‘Ayn for hot-weather activities are from late May to early July and from late August to early October.

Temperature

The hot season lasts for 3.3 months, from June 7 to September 17, with an average daily high temperature above 94°F. The hottest day of the year is July 26, with an average high of 104°F and low of 78°F.

The cool season lasts for 3.7 months, from November 24 to March 14, with an average daily high temperature below 62°F. The coldest day of the year is January 23, with an average low of 35°F and high of 52°F.

Average High and Low Temperature

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 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

Average Hourly Temperature in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoldcoolhotcoolwarmvery coldvery coldswelteringvery coldhotvery coldcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Summerlin South, Nevada, United States (7,162 miles away) is the far-away foreign place with temperatures most similar to Ra’s al ‘Ayn (view comparison).

Clouds

In Ra’s al ‘Ayn, 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 Ra’s al ‘Ayn begins around May 16 and lasts for 4.8 months, ending around October 10. On July 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 100% of the time, and overcast or mostly cloudy -0% of the time.

The cloudier part of the year begins around October 10 and lasts for 7.2 months, ending around May 16. On December 24, the cloudiest day of the year, the sky is overcast or mostly cloudy 45% of the time, and clear, mostly clear, or partly cloudy 55% of the time.

Cloud Cover Categories

Cloud Cover Categories in Ra’s al ‘AynclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 12100%Jul 12100%Dec 2455%Dec 2455%May 1677%May 1677%Oct 1078%Oct 1078%clearovercastmostly clearmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Ra’s al ‘Ayn varies throughout the year.

The wetter season lasts 6.8 months, from October 19 to May 12, with a greater than 10% chance of a given day being a wet day. The chance of a wet day peaks at 21% on February 11.

The drier season lasts 5.2 months, from May 12 to October 19. The smallest chance of a wet day is 0% on July 11.

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 throughout the year is rain alone, with a peak probability of 20% on February 11.

Daily Chance of Precipitation

Daily Chance of Precipitation in Ra’s al ‘AynwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 1121%Feb 1121%Jul 110%Jul 110%Jan 117%Jan 117%Oct 1910%Oct 1910%May 1210%May 1210%rain
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 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. Ra’s al ‘Ayn experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.9 months, from October 16 to May 14, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 6, with an average total accumulation of 1.2 inches.

The rainless period of the year lasts for 5.1 months, from May 14 to October 16. The least rain falls around July 25, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

Average Monthly Rainfall in Ra’s al ‘AynrainrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 inFeb 61.2 inFeb 61.2 inJul 250.0 inJul 250.0 inOct 160.5 inOct 160.5 inMay 140.5 inMay 140.5 in
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

The length of the day in Ra’s al ‘Ayn varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 38 minutes of daylight; the longest day is June 21, with 14 hours, 41 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 41 minJun 2114 hr, 41 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 38 minDec 219 hr, 38 minDec 21nightnightday
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 is at 4:59 AM on June 13, and the latest sunrise is 1 hour, 38 minutes later at 6:37 AM on October 26. The earliest sunset is at 4:03 PM on December 6, and the latest sunset is 3 hours, 40 minutes later at 7:42 PM on June 28.

Daylight saving time (DST) is observed in Ra’s al ‘Ayn during 2017, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 26.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 134:59 AMJun 134:59 AM7:42 PMJun 287:42 PMJun 28Dec 64:03 PMDec 64:03 PM6:37 AMOct 266:37 AMOct 26Mar 31DSTMar 31DSTDSTOct 26DSTOct 26daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

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 perceived humidity level in Ra’s al ‘Ayn, 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

Humidity Comfort Levels in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 110%Feb 110%Aug 61%Aug 61%drydrycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Ra’s al ‘Ayn experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.4 months, from May 28 to September 9, with average wind speeds of more than 8.3 miles per hour. The windiest day of the year is July 1, with an average hourly wind speed of 10.0 miles per hour.

The calmer time of year lasts for 8.6 months, from September 9 to May 28. The calmest day of the year is November 1, with an average hourly wind speed of 6.6 miles per hour.

Average Wind Speed

Average Wind Speed in Ra’s al ‘AynwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mphJul 110.0 mphJul 110.0 mphNov 16.6 mphNov 16.6 mphSep 98.3 mphSep 98.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Ra’s al ‘Ayn varies throughout the year.

The wind is most often from the west for 7.4 months, from March 10 to October 23, with a peak percentage of 67% on August 20. The wind is most often from the north for 3.7 weeks, from October 23 to November 18, with a peak percentage of 31% on November 17. The wind is most often from the east for 3.7 months, from November 18 to March 10, with a peak percentage of 41% on January 1.

Wind Direction

Wind Direction in Ra’s al ‘AynEWNEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%eastwestnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Ra’s al ‘Ayn 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 times of year to visit Ra’s al ‘Ayn for general outdoor tourist activities are from late April to late May and from late September to late October, with a peak score in the second week of October.

Tourism Score

Tourism Score in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec02468107.87.80.80.87.57.54.24.2precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 times of year to visit Ra’s al ‘Ayn for hot-weather activities are from late May to early July and from late August to early October, with a peak score in the second week of September.

Beach/Pool Score

Beach/Pool Score in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec02468108.88.80.00.08.58.56.76.7 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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.

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 Ra’s al ‘Ayn typically lasts for 9.3 months (286 days), from around March 2 to around December 13, rarely starting before February 3 or after March 25, and rarely ending before November 19 or after January 7.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Ra’s al ‘Ayngrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 250%Mar 250%Dec 1350%Dec 1390%Mar 2590%Mar 2590%Nov 1990%Nov 1910%Feb 310%Feb 310%Jan 710%Jan 7Jul 22100%Jul 22100%warmhotcoldcoolvery coldswelteringfreezingcomfortable
The percentage of time spent in various temperature bands: 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 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 Ra’s al ‘Ayn should appear around March 4, only rarely appearing before February 19 or after March 21.

Growing Degree Days

Growing Degree Days in Ra’s al ‘AynJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°FMar 479°FMar 479°FMay 16900°FMay 16900°FDec 316,030°FDec 316,030°F
The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 14 to August 24, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 25, with an average of 8.7 kWh.

The darker period of the year lasts for 3.5 months, from November 2 to February 16, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 24, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Ra’s al ‘AynbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 258.7 kWhJun 258.7 kWhDec 242.3 kWhDec 242.3 kWhMay 147.4 kWhMay 147.4 kWhAug 247.4 kWhAug 247.4 kWhNov 23.6 kWhNov 23.6 kWhFeb 163.6 kWhFeb 163.6 kWh
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 Ra’s al ‘Ayn are 36.850 deg latitude, 40.071 deg longitude, and 1,204 ft elevation.

The topography within 2 miles of Ra’s al ‘Ayn contains only modest variations in elevation, with a maximum elevation change of 138 feet and an average elevation above sea level of 1,188 feet. Within 10 miles also contains only modest variations in elevation (456 feet). Within 50 miles contains only modest variations in elevation (3,809 feet).

The area within 2 miles of Ra’s al ‘Ayn is covered by cropland (72%) and artificial surfaces (12%), within 10 miles by cropland (80%) and grassland (16%), and within 50 miles by cropland (54%) and bare soil (22%).

Data Sources

This report illustrates the typical weather in Ra’s al ‘Ayn, 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 Ra’s al ‘Ayn.

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

The stations contributing to this reconstruction are: Kamishli (45%, 101 kilometers, east); Diyarbakır Airport (35%, 117 kilometers, north); and Deir ez-Zor Airport (20%, 175 kilometers, south).

Other Data

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.

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.