Summer Weather in Keetmanshoop NamibiaDaily high temperatures are around 94°F, rarely falling below 84°F or exceeding 102°F. The highest daily average high temperature is 95°F on December 26. Daily low temperatures increase by 4°F, from 65°F to 69°F, rarely falling below 57°F or exceeding 77°F. The highest daily average low temperature is 70°F on January 30. For reference, on December 26, the hottest day of the year, temperatures in Keetmanshoop typically range from 68°F to 95°F, while on July 7, the coldest day of the year, they range from 46°F to 71°F. The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Santa Catarina, Mexico (8,675 miles away) and Biloela, Australia (7,702 miles) are the far-away foreign places with temperatures most similar to Keetmanshoop (view comparison). CloudsThe summer in Keetmanshoop experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 16% throughout the season. The highest chance of overcast or mostly cloudy conditions is 19% on January 29. The lowest chance of overcast or mostly cloudy conditions is 13% on December 19. The clearest day of the summer is December 19, with clear, mostly clear, or partly cloudy conditions 87% of the time. For reference, on October 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 20%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Keetmanshoop, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 6% and ending it at 15%. For reference, the year's highest daily chance of a wet day is 18% on February 3, and its lowest chance is 0% on August 21. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the summer in Keetmanshoop is increasing, starting the season at 0.5 inches, when it rarely exceeds 1.5 inches or falls below -0.0 inches, and ending the season at 1.2 inches, when it rarely exceeds 3.1 inches or falls below 0.2 inches. The highest average 31-day accumulation is 1.3 inches on February 10. SunOver the course of the summer in Keetmanshoop, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 3 minutes, implying an average daily decrease of 42 seconds, and weekly decrease of 4 minutes, 55 seconds. The shortest day of the summer is February 28, with 12 hours, 39 minutes of daylight and the longest day is December 21, with 13 hours, 49 minutes of daylight. The earliest sunrise of the summer in Keetmanshoop is 5:46 AM on December 1 and the latest sunrise is 54 minutes later at 6:40 AM on February 28. The latest sunset is 7:45 PM on January 11 and the earliest sunset is 26 minutes earlier at 7:19 PM on February 28. Daylight saving time is not observed in Keetmanshoop during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 5:51 AM and sets 13 hours, 49 minutes later, at 7:40 PM, while on June 20, the shortest day of the year, it rises at 7:35 AM and sets 10 hours, 28 minutes later, at 6:03 PM. 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 the summer of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon. 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. The chance that a given day will be muggy in Keetmanshoop is gradually increasing during the summer, rising from 0% to 3% over the course of the season. The highest chance of a muggy day during the summer is 3% on January 28. For reference, on January 28, the muggiest day of the year, there are muggy conditions 3% of the time, while on May 16, the least muggy day of the year, there are muggy conditions 0% of the time. 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 Keetmanshoop is decreasing during the summer, decreasing from 9.9 miles per hour to 8.3 miles per hour over the course of the season. For reference, on November 12, the windiest day of the year, the daily average wind speed is 10.1 miles per hour, while on March 14, the calmest day of the year, the daily average wind speed is 8.1 miles per hour. The hourly average wind direction in Keetmanshoop throughout the summer is predominantly from the south, with a peak proportion of 57% on December 26. 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 Keetmanshoop 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. The average accumulated growing degree days in Keetmanshoop are very rapidly increasing during the summer, increasing by 2,599°F, from 2,747°F to 5,346°F, over the course of the season. 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 in Keetmanshoop is decreasing during the summer, falling by 1.4 kWh, from 8.9 kWh to 7.5 kWh, over the course of the season. The highest average daily incident shortwave solar energy during the summer is 9.1 kWh on December 19. TopographyFor the purposes of this report, the geographical coordinates of Keetmanshoop are -26.583 deg latitude, 18.133 deg longitude, and 3,219 ft elevation. The topography within 2 miles of Keetmanshoop contains only modest variations in elevation, with a maximum elevation change of 423 feet and an average elevation above sea level of 3,243 feet. Within 10 miles contains only modest variations in elevation (1,122 feet). Within 50 miles contains very significant variations in elevation (4,009 feet). The area within 2 miles of Keetmanshoop is covered by sparse vegetation (97%), within 10 miles by sparse vegetation (95%), and within 50 miles by sparse vegetation (58%) and grassland (38%). Data SourcesThis report illustrates the typical weather in Keetmanshoop, 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 is only a single weather station, Keetmanshoop Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Keetmanshoop. At a distance of 5 kilometers from Keetmanshoop, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records. The station records are corrected for the elevation difference between the station and Keetmanshoop according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis. 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. 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