Climate and Average Weather Year Round in As Sūsah Syria

In As Sūsah, the summers are sweltering, arid, and clear and the winters are cold, dry, and mostly clear. Over the course of the year, the temperature typically varies from 37°F to 106°F and is rarely below 29°F or above 111°F.

Based on the beach/pool score, the best times of year to visit As Sūsah for hot-weather activities are from mid May to late June and from early September to early October.

The hot season lasts for 3.7 months, from May 28 to September 18, with an average daily high temperature above 96°F. The hottest month of the year in As Sūsah is July, with an average high of 105°F and low of 81°F.

The cool season lasts for 3.4 months, from November 23 to March 3, with an average daily high temperature below 66°F. The coldest month of the year in As Sūsah is January, with an average low of 38°F and high of 56°F.

In As Sūsah, 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 As Sūsah begins around May 19 and lasts for 4.8 months, ending around October 11.

The clearest month of the year in As Sūsah is July, during which on average the sky is clear, mostly clear, or partly cloudy 100% of the time.

The cloudier part of the year begins around October 11 and lasts for 7.2 months, ending around May 19.

The cloudiest month of the year in As Sūsah is December, during which on average the sky is overcast or mostly cloudy 35% of the time.

As Sūsah 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 9%, with an average value of 4%.

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 As Sūsah is January, with an average of 2.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 9% on December 31.

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. As Sūsah experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 1.1 months, from December 31 to February 2, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in As Sūsah is January, with an average rainfall of 0.5 inches.

The rainless period of the year lasts for 11 months, from February 2 to December 31. The month with the least rain in As Sūsah is June, with an average rainfall of 0.0 inches.

The length of the day in As Sūsah varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 51 minutes of daylight; the longest day is June 20, with 14 hours, 28 minutes of daylight.

The earliest sunrise is at 5:02 AM on June 12, and the latest sunrise is 2 hours, 21 minutes later at 7:23 AM on January 8. The earliest sunset is at 5:05 PM on December 4, and the latest sunset is 2 hours, 28 minutes later at 7:32 PM on June 29.

Daylight saving time (DST) is not observed in As Sūsah during 2024.

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.

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 As Sūsah, 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.

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 As Sūsah experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 2.9 months, from May 25 to August 23, with average wind speeds of more than 9.8 miles per hour. The windiest month of the year in As Sūsah is July, with an average hourly wind speed of 12.2 miles per hour.

The calmer time of year lasts for 9.1 months, from August 23 to May 25. The calmest month of the year in As Sūsah is November, with an average hourly wind speed of 7.1 miles per hour.

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

To characterize how pleasant the weather is in As Sūsah 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 As Sūsah for general outdoor tourist activities are from late March to mid May and from late September to early November, with a peak score in the third week of October.

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 As Sūsah for hot-weather activities are from mid May to late June and from early September to early October, with a peak score in the third week of September.

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 As Sūsah typically lasts for 10 months (311 days), from around February 4 to around December 12, rarely starting after March 6, or ending before November 17.

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 As Sūsah should appear around February 12, only rarely appearing before February 2 or after February 26.

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 3.5 months, from May 7 to August 22, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest month of the year in As Sūsah is June, with an average of 8.4 kWh.

The darker period of the year lasts for 3.2 months, from November 2 to February 10, with an average daily incident shortwave energy per square meter below 3.9 kWh. The darkest month of the year in As Sūsah is December, with an average of 2.8 kWh.

For the purposes of this report, the geographical coordinates of As Sūsah are 34.534 deg latitude, 40.958 deg longitude, and 568 ft elevation.

The topography within 2 miles of As Sūsah contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 574 feet. Within 10 miles also contains only modest variations in elevation (308 feet). Within 50 miles contains only modest variations in elevation (1,119 feet).

The area within 2 miles of As Sūsah is covered by cropland (58%) and bare soil (25%), within 10 miles by bare soil (61%) and cropland (26%), and within 50 miles by bare soil (89%).