Average Weather in August in Ilulissat Greenland
In Ilulissat, the month of August is characterized by falling daily high temperatures, with daily highs decreasing by 6°F, from 51°F to 45°F over the course of the month, and rarely exceeding 57°F or dropping below 40°F.
Daily low temperatures decrease by 4°F, from 42°F to 38°F, rarely falling below 32°F or exceeding 47°F.
For reference, on July 18, the hottest day of the year, temperatures in Ilulissat typically range from 42°F to 52°F, while on February 27, the coldest day of the year, they range from -3°F to 8°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in Ilulissat experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 57% throughout the month. The highest chance of overcast or mostly cloudy conditions is 59% on August 16.
The clearest day of the month is August 3, with clear, mostly clear, or partly cloudy conditions 45% of the time.
For reference, on January 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on July 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 51%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ilulissat, the chance of a wet day over the course of August is essentially constant, remaining around 21% throughout.
For reference, the year's highest daily chance of a wet day is 23% on August 16, and its lowest chance is 6% on January 6.
Probability of Precipitation in August
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 August in Ilulissat is essentially constant, remaining about 1.7 inches throughout, and rarely exceeding 4.0 inches or falling below 0.3 inches.
The highest average 31-day accumulation is 1.8 inches on August 16.
Average Monthly Rainfall in August
Due to its extreme latitude, Ilulissat experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.
Neither polar day nor polar night occur during the month of August.
Over the course of August in Ilulissat, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 5 hours, 1 minute, implying an average daily decrease of 10 minutes, 2 seconds, and weekly decrease of 1 hour, 10 minutes, 13 seconds.
The shortest day of the month is August 31, with 15 hours, 24 minutes of daylight and the longest day is August 1, with 20 hours, 25 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Ilulissat is 3:15 AM on August 1 and the latest sunrise is 2 hours, 26 minutes later at 5:41 AM on August 31.
The latest sunset is 11:40 PM on August 1 and the earliest sunset is 2 hours, 35 minutes earlier at 9:05 PM on August 31.
Daylight saving time is observed in Ilulissat during 2017, but it neither starts nor ends during August, so the entire month is in daylight saving time.
Sunrise & Sunset with Twilight in August
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 Ilulissat is essentially constant during August, remaining around 0% throughout.
Humidity Comfort Levels in August
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 Ilulissat is gradually increasing during August, increasing from 3.3 miles per hour to 4.0 miles per hour over the course of the month.
For reference, on November 29, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on July 14, the calmest day of the year, the daily average wind speed is 3.0 miles per hour.
Average Wind Speed in August
Wind Direction in August
Ilulissat 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 surface water temperature in Ilulissat is essentially constant during August, remaining around 38°F throughout.
The highest average surface water temperature during August is 39°F on August 23.
Average Water Temperature in August
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 Ilulissat is rapidly decreasing during August, falling by 1.8 kWh, from 4.8 kWh to 3.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Ilulissat are 69.217 deg latitude, -51.100 deg longitude, and 0 ft elevation.
The topography within 2 miles of Ilulissat contains only modest variations in elevation, with a maximum elevation change of 394 feet and an average elevation above sea level of 101 feet. Within 10 miles contains only modest variations in elevation (1,654 feet). Within 50 miles contains very significant variations in elevation (4,396 feet).
The area within 2 miles of Ilulissat is covered by water (28%), sparse vegetation (25%), trees (17%), and snow and glaciers (16%), within 10 miles by water (50%) and snow and glaciers (21%), and within 50 miles by water (41%) and snow and glaciers (32%).
This report illustrates the typical weather in Ilulissat 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, Egedesminde, in our network suitable to be used as a proxy for the historical temperature and dew point records of Ilulissat.
At a distance of 91 kilometers from Ilulissat, 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 Ilulissat 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.