Average Weather in April in Grootfontein Namibia
Daily high temperatures are around 81°F, rarely falling below 76°F or exceeding 87°F.
Daily low temperatures decrease by 5°F, from 61°F to 56°F, rarely falling below 50°F or exceeding 66°F.
For reference, on October 20, the hottest day of the year, temperatures in Grootfontein typically range from 64°F to 89°F, while on July 8, the coldest day of the year, they range from 45°F to 73°F.
Average High and Low Temperature in April
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.
Average Hourly Temperature in April
The month of April in Grootfontein experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 38% to 12%.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 88% of the time.
For reference, on January 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on June 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 95%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grootfontein, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 23% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 47% on February 1, and its lowest chance is 0% on July 8.
Probability of Precipitation in April
To 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 Grootfontein is rapidly decreasing, starting the month at 1.8 inches, when it rarely exceeds 3.8 inches or falls below 0.2 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.1 inches or falls below -0.0 inches.
Average Monthly Rainfall in April
Over the course of April in Grootfontein, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 30 minutes, implying an average daily decrease of 1 minute, 1 second, and weekly decrease of 7 minutes, 10 seconds.
The shortest day of the month is April 30, with 11 hours, 24 minutes of daylight and the longest day is April 1, with 11 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in April
The earliest sunrise of the month in Grootfontein is 5:54 AM on April 1 and the latest sunrise is 8 minutes later at 6:02 AM on April 30.
The latest sunset is 5:48 PM on April 1 and the earliest sunset is 21 minutes earlier at 5:26 PM on April 30.
Daylight saving time (DST) ends at 1:00 AM on April 1, 2018, shifting sunrise and sunset to be an hour earlier.
For reference, on December 21, the longest day of the year, the Sun rises at 6:06 AM and sets 13 hours, 19 minutes later, at 7:25 PM, while on June 21, the shortest day of the year, it rises at 6:20 AM and sets 10 hours, 57 minutes later, at 5:17 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
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 chance that a given day will be muggy in Grootfontein is essentially constant during April, remaining within 1% of 1% throughout.
For reference, on January 29, the muggiest day of the year, there are muggy conditions 9% of the time, while on May 25, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
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 Grootfontein is essentially constant during April, remaining within 0.2 miles per hour of 7.6 miles per hour throughout.
For reference, on October 1, the windiest day of the year, the daily average wind speed is 9.8 miles per hour, while on February 13, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.
Average Wind Speed in April
Wind Direction in April
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).
While it does not do so every year, freezing temperatures are seen in Grootfontein over some winters. The day least likely to be in the growing season is July 11, with a 75% chance.
Time Spent in Various Temperature Bands and the Growing Season in April
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 Grootfontein are rapidly increasing during April, increasing by 565°F, from 5,904°F to 6,469°F, over the course of the month.
Growing Degree Days in April
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 in Grootfontein is essentially constant during April, remaining within 0.2 kWh of 6.1 kWh throughout.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Grootfontein are -19.567 deg latitude, 18.117 deg longitude, and 4,695 ft elevation.
The topography within 2 miles of Grootfontein contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 4,729 feet. Within 10 miles contains only modest variations in elevation (1,257 feet). Within 50 miles contains very significant variations in elevation (3,173 feet).
The area within 2 miles of Grootfontein is covered by grassland (70%) and artificial surfaces (22%), within 10 miles by grassland (76%) and trees (21%), and within 50 miles by grassland (77%) and trees (15%).
This report illustrates the typical weather in Grootfontein year round, 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, Grootfontein Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Grootfontein.
At a distance of 4 kilometers from Grootfontein, 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 Grootfontein 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.
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.