Average Weather in Ar Rubū‘ Yemen
In Ar Rubū‘, the summers are short, hot, and mostly cloudy; the winters are short, comfortable, and mostly clear; and it is dry year round. Over the course of the year, the temperature typically varies from 56°F to 88°F and is rarely below 53°F or above 92°F.
Based on the tourism score, the best time of year to visit Ar Rubū‘ for warm-weather activities is from early October to mid April.
The hot season lasts for 2.5 months, from April 26 to July 11, with an average daily high temperature above 85°F. The hottest day of the year is June 3, with an average high of 88°F and low of 68°F.
The cool season lasts for 2.3 months, from December 1 to February 12, with an average daily high temperature below 78°F. The coldest day of the year is December 25, with an average low of 56°F and high of 76°F.
Average High and Low Temperature
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 Ar Rubū‘, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Ar Rubū‘ begins around September 25 and lasts for 7.1 months, ending around April 28. On November 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 21% of the time.
The cloudier part of the year begins around April 28 and lasts for 4.9 months, ending around September 25. On July 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Ar Rubū‘ varies throughout the year.
The wetter season lasts 2.2 months, from July 5 to September 10, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 22% on July 30.
The drier season lasts 9.8 months, from September 10 to July 5. The smallest chance of a wet day is 1% on November 9.
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 22% on July 30.
Daily Chance of Precipitation
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. Ar Rubū‘ experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 6.7 months, from March 25 to October 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 4, with an average total accumulation of 2.0 inches.
The rainless period of the year lasts for 5.3 months, from October 16 to March 25. The least rain falls around December 23, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall
The length of the day in Ar Rubū‘ varies over the course of the year. In 2019, the shortest day is December 22, with 11 hours, 19 minutes of daylight; the longest day is June 21, with 12 hours, 57 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:35 AM on June 1, and the latest sunrise is 57 minutes later at 6:32 AM on January 24. The earliest sunset is at 5:33 PM on November 21, and the latest sunset is 1 hour, 3 minutes later at 6:36 PM on July 10.
Daylight saving time (DST) is not observed in Ar Rubū‘ during 2019.
Sunrise & Sunset with 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.
Ar Rubū‘ experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.9 months, from May 13 to October 10, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The muggiest day of the year is August 19, with muggy conditions 38% of the time.
The least muggy day of the year is January 13, with muggy conditions 2% of the time.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Ar Rubū‘ experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 2.1 months, from June 23 to August 25, with average wind speeds of more than 7.0 miles per hour. The windiest day of the year is July 24, with an average hourly wind speed of 9.0 miles per hour.
The calmer time of year lasts for 9.9 months, from August 25 to June 23. The calmest day of the year is September 27, with an average hourly wind speed of 5.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Ar Rubū‘ varies throughout the year.
The wind is most often from the west for 1.1 months, from May 22 to June 26 and for 3.9 weeks, from August 27 to September 23, with a peak percentage of 43% on August 27. The wind is most often from the north for 2.0 months, from June 26 to August 27, with a peak percentage of 52% on July 24. The wind is most often from the east for 8.0 months, from September 23 to May 22, with a peak percentage of 50% on January 1.
Ar Rubū‘ 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 4.7 months, from May 22 to October 13, with an average temperature above 86°F. The day of the year with the warmest water is September 12, with an average temperature of 88°F.
The time of year with cooler water lasts for 3.5 months, from December 5 to March 22, with an average temperature below 80°F. The day of the year with the coolest water is January 31, with an average temperature of 78°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Ar Rubū‘ 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 Rubū‘ for general outdoor tourist activities is from early October to mid April, with a peak score in the second week of November.
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 Ar Rubū‘ for hot-weather activities are from mid March to early July and from late August to mid October, with a peak score in the second week of April.
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 Ar Rubū‘ 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
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
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 some seasonal variation over the course of the year.
The brighter period of the year lasts for 2.2 months, from February 22 to April 28, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest day of the year is March 21, with an average of 7.0 kWh.
The darker period of the year lasts for 1.7 months, from July 8 to August 31, with an average daily incident shortwave energy per square meter below 5.7 kWh. The darkest day of the year is July 28, with an average of 5.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Ar Rubū‘ are 13.780 deg latitude, 43.869 deg longitude, and 4,429 ft elevation.
The topography within 2 miles of Ar Rubū‘ contains large variations in elevation, with a maximum elevation change of 2,546 feet and an average elevation above sea level of 4,584 feet. Within 10 miles contains large variations in elevation (6,529 feet). Within 50 miles also contains extreme variations in elevation (10,633 feet).
The area within 2 miles of Ar Rubū‘ is covered by bare soil (60%) and trees (40%), within 10 miles by bare soil (60%) and sparse vegetation (31%), and within 50 miles by bare soil (58%) and sparse vegetation (28%).
This report illustrates the typical weather in Ar Rubū‘, 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 Ar Rubū‘.
For each station, the records are corrected for the elevation difference between that station and Ar Rubū‘ 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 Rubū‘ is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ar Rubū‘ and a given station.
The stations contributing to this reconstruction are: Ta'izz International Airport (86%, 31 kilometers, east); Dhamar (8%, 107 kilometers, northeast); and Hodeidah Airport (6%, 144 kilometers, northwest).
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.