Average Weather in Merowe Sudan
In Merowe, the summers are long, sweltering, arid, and partly cloudy and the winters are short, comfortable, dry, windy, and mostly clear. Over the course of the year, the temperature typically varies from 55°F to 109°F and is rarely below 48°F or above 113°F.
Based on the beach/pool score, the best times of year to visit Merowe for hot-weather activities are from early March to mid April and from late October to early December.
The hot season lasts for 5.5 months, from April 25 to October 10, with an average daily high temperature above 103°F. The hottest day of the year is June 7, with an average high of 109°F and low of 82°F.
The cool season lasts for 2.5 months, from December 5 to February 20, with an average daily high temperature below 86°F. The coldest day of the year is January 18, with an average low of 55°F and high of 81°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
Tékane, Mauritania (3,112 miles away); Derby, Australia (6,714 miles); and Kununurra, Australia (7,008 miles) are the far-away foreign places with temperatures most similar to Merowe (view comparison).
In Merowe, 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 Merowe begins around September 20 and lasts for 9.0 months, ending around June 18. On May 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 87% of the time, and overcast or mostly cloudy 13% of the time.
The cloudier part of the year begins around June 18 and lasts for 3.0 months, ending around September 20. On August 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.
Cloud Cover Categories
Merowe 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 3%, with an average value of 0%.
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 3% on July 28.
Daily Chance of Precipitation
The sliding 31-day quantity of rainfall in Merowe does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Monthly Rainfall
The length of the day in Merowe varies over the course of the year. In 2018, the shortest day is December 22, with 11 hours, 1 minute of daylight; the longest day is June 21, with 13 hours, 14 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:15 AM on June 5, and the latest sunrise is 1 hour, 13 minutes later at 7:28 AM on January 19. The earliest sunset is at 6:14 PM on November 24, and the latest sunset is 1 hour, 19 minutes later at 7:33 PM on July 6.
Daylight saving time (DST) is not observed in Merowe during 2018.
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.
Merowe experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.5 months, from July 3 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 3% of the time. The muggiest day of the year is August 8, with muggy conditions 12% of the time.
The least muggy day of the year is March 25, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 Merowe experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 9.3 months, from September 16 to June 24, with average wind speeds of more than 10.3 miles per hour. The windiest day of the year is March 12, with an average hourly wind speed of 11.7 miles per hour.
The calmer time of year lasts for 2.7 months, from June 24 to September 16. The calmest day of the year is August 2, with an average hourly wind speed of 8.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Merowe is from the north throughout the year.
Best Time of Year to Visit
To characterize how pleasant the weather is in Merowe 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 Merowe for general outdoor tourist activities is from late November to early March, with a peak score in the last week of January.
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 Merowe for hot-weather activities are from early March to mid April and from late October to early December, with a peak score in the second week of November.
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 Merowe 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 4.0 months, from March 21 to July 21, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 18, with an average of 7.8 kWh.
The darker period of the year lasts for 2.4 months, from November 13 to January 24, with an average daily incident shortwave energy per square meter below 5.8 kWh. The darkest day of the year is December 19, with an average of 5.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Merowe are 18.470 deg latitude, 31.811 deg longitude, and 853 ft elevation.
The topography within 2 miles of Merowe contains only modest variations in elevation, with a maximum elevation change of 164 feet and an average elevation above sea level of 850 feet. Within 10 miles also contains only modest variations in elevation (463 feet). Within 50 miles contains only modest variations in elevation (1,850 feet).
The area within 2 miles of Merowe is covered by bare soil (57%), artificial surfaces (17%), and cropland (15%), within 10 miles by bare soil (85%), and within 50 miles by bare soil (96%).
This report illustrates the typical weather in Merowe, 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 is only a single weather station, Dongola Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Merowe.
At a distance of 164 kilometers from Merowe, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere .
The weight assigned to the MERRA-2 value depends on the distance from Merowe to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 22%, making the weight assigned to the weather station 78%.
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.
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.