April Weather in Luanda KenyaDaily high temperatures decrease by 2°F, from 82°F to 80°F, rarely falling below 76°F or exceeding 87°F. Daily low temperatures are around 66°F, rarely falling below 64°F or exceeding 68°F. For reference, on February 11, the hottest day of the year, temperatures in Luanda typically range from 65°F to 86°F, while on July 12, the coldest day of the year, they range from 64°F to 81°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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. La Plata, Colombia (7,603 miles away) and Nirgua, Venezuela (7,081 miles) are the far-away foreign places with temperatures most similar to Luanda (view comparison). CloudsThe month of April in Luanda experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 83% throughout the month. The highest chance of overcast or mostly cloudy conditions is 84% on April 16. The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 18% of the time. For reference, on April 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 84%, while on August 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 50%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Luanda, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 66% and ending it at 81%. For reference, the year's highest daily chance of a wet day is 82% on May 2, and its lowest chance is 24% on February 11. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during April in Luanda is increasing, starting the month at 8.3 inches, when it rarely exceeds 13.7 inches or falls below 3.8 inches, and ending the month at 9.2 inches, when it rarely exceeds 12.6 inches or falls below 5.6 inches. The highest average 31-day accumulation is 9.5 inches on April 21. SunOver the course of April in Luanda, the length of the day is essentially constant. The shortest day of the month is April 1, with 12 hours, 7 minutes of daylight and the longest day is April 30, with 12 hours, 7 minutes of daylight. The latest sunrise of the month in Luanda is 6:44 AM on April 1 and the earliest sunrise is 7 minutes earlier at 6:37 AM on April 30. The latest sunset is 6:50 PM on April 1 and the earliest sunset is 6 minutes earlier at 6:44 PM on April 30. Daylight saving time is not observed in Luanda during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 6:41 AM and sets 12 hours, 8 minutes later, at 6:49 PM, while on December 21, the shortest day of the year, it rises at 6:38 AM and sets 12 hours, 6 minutes later, at 6:45 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 April 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 Luanda is increasing during April, rising from 64% to 73% over the course of the month. For reference, on May 1, the muggiest day of the year, there are muggy conditions 73% of the time, while on July 17, the least muggy day of the year, there are muggy conditions 12% 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 Luanda is gradually decreasing during April, decreasing from 5.4 miles per hour to 4.4 miles per hour over the course of the month. For reference, on February 11, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on September 24, the calmest day of the year, the daily average wind speed is 4.2 miles per hour. The wind direction in Luanda during April is predominantly out of the east from April 1 to April 6 and the west from April 6 to April 30. 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 Luanda 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 Luanda are rapidly increasing during April, increasing by 646°F, from 2,194°F to 2,840°F, over the course of the month. 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 Luanda is gradually decreasing during April, falling by 1.0 kWh, from 6.2 kWh to 5.2 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Luanda are 0.297 deg latitude, 34.065 deg longitude, and 3,878 ft elevation. The topography within 2 miles of Luanda contains only modest variations in elevation, with a maximum elevation change of 223 feet and an average elevation above sea level of 3,812 feet. Within 10 miles contains only modest variations in elevation (1,463 feet). Within 50 miles contains very significant variations in elevation (4,537 feet). The area within 2 miles of Luanda is covered by cropland (43%), herbaceous vegetation (29%), and grassland (21%), within 10 miles by cropland (50%) and trees (17%), and within 50 miles by cropland (39%) and water (26%). Data SourcesThis report illustrates the typical weather in Luanda, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Luanda. For each station, the records are corrected for the elevation difference between that station and Luanda 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 Luanda is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Luanda and a given station. The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Luanda and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. 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. 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. Please review our full terms contained on our Terms of Service page. |