Summer Weather in Sisimiut GreenlandDaily high temperatures increase by 4°F, from 42°F to 46°F, rarely falling below 34°F or exceeding 57°F. The highest daily average high temperature is 51°F on July 23. Daily low temperatures increase by 6°F, from 33°F to 39°F, rarely falling below 28°F or exceeding 45°F. The highest daily average low temperature is 41°F on July 30. For reference, on July 23, the hottest day of the year, temperatures in Sisimiut typically range from 41°F to 51°F, while on February 24, the coldest day of the year, they range from 2°F to 10°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. 
Compare Sisimiut to another city:CloudsThe summer in Sisimiut experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 63% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 59% on June 24. The clearest day of the summer is June 24, with clear, mostly clear, or partly cloudy conditions 41% of the time. For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 85%, while on June 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 41%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sisimiut, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 16% and ending it at 25%. For reference, the year's highest daily chance of a wet day is 28% on August 14, and its lowest chance is 7% on February 16. Over the course of the summer in Sisimiut, the chance of a day with only rain increases from 14% to 25%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout. 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 Sisimiut is increasing, starting the season at 1.1 inches, when it rarely exceeds 2.6 inches or falls below 0.1 inches, and ending the season at 2.1 inches, when it rarely exceeds 3.7 inches or falls below 0.7 inches. The highest average 31-day accumulation is 2.5 inches on August 10. Average Monthly Rainfall in the Summer in Sisimiut
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
SunDue to its extreme latitude, Sisimiut experiences polar day (also known as the midnight Sun) during the summer. 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. In the summer in Sisimiut during 2024, the Sun is continuously above the horizon for 1.3 months, rising at 2:54 AM on June 1, and not setting again until 2:27 AM on July 10. As such, polar day begins and ends during the summer. The shortest day of the summer is August 31, with 14 hours, 59 minutes of daylight. The earliest sunrise of the summer in Sisimiut is 2:53 AM on July 10 and the latest sunrise is 4 hours, 11 minutes later at 7:04 AM on August 31. The latest sunset is 2:27 AM on July 9 and the earliest sunset is 4 hours, 25 minutes earlier at 10:02 PM on August 31. Daylight saving time is observed in Sisimiut during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time. Sunrise & Sunset with Twilight in the Summer in Sisimiut
The solar day in the summer. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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. Solar Elevation and Azimuth in the Summer in Sisimiut
northeastsouthwest
Solar elevation and azimuth in the the summer of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).
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 Sisimiut is essentially constant during the summer, remaining around 0% throughout. 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 Sisimiut is essentially constant during the summer, remaining within 0.6 miles per hour of 7.7 miles per hour throughout. For reference, on December 2, the windiest day of the year, the daily average wind speed is 10.9 miles per hour, while on July 13, the calmest day of the year, the daily average wind speed is 7.1 miles per hour. The lowest daily average wind speed during the summer is 7.1 miles per hour on July 14. The wind direction in Sisimiut during the summer is predominantly out of the north from June 1 to August 1 and from August 11 to August 31 and the south from August 1 to August 11. Wind Direction in the Summer in Sisimiut
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
Water TemperatureSisimiut 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 Sisimiut is increasing during the summer, rising by 6°F, from 35°F to 41°F, over the course of the season. The highest average surface water temperature during the summer is 41°F on August 20. 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). The growing season in Sisimiut typically lasts for 3.3 months (102 days), from around June 12 to around September 22, rarely starting before May 24 or after July 4, and rarely ending before September 3 or after October 10. The largest chance that a given day will be within the growing season in Sisimiut during the summer is 100% on August 2. Time Spent in Various Temperature Bands and the Growing Season in the Summer in Sisimiut
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within 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. The average accumulated growing degree days in Sisimiut are essentially constant during the summer, remaining within 16°F of 16°F throughout. 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 Sisimiut is very rapidly decreasing during the summer, falling by 2.8 kWh, from 5.7 kWh to 2.9 kWh, over the course of the season. The highest average daily incident shortwave solar energy during the summer is 5.8 kWh on June 18. TopographyFor the purposes of this report, the geographical coordinates of Sisimiut are 66.939 deg latitude, -53.674 deg longitude, and 20 ft elevation. The topography within 2 miles of Sisimiut contains very significant variations in elevation, with a maximum elevation change of 1,549 feet and an average elevation above sea level of 204 feet. Within 10 miles contains very significant variations in elevation (2,398 feet). Within 50 miles contains large variations in elevation (5,971 feet). The area within 2 miles of Sisimiut is covered by sparse vegetation (36%), snow and glaciers (25%), and grassland (24%), within 10 miles by water (48%) and snow and glaciers (21%), and within 50 miles by water (52%) and sparse vegetation (14%). Data SourcesThis report illustrates the typical weather in Sisimiut, 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 Sisimiut. For each station, the records are corrected for the elevation difference between that station and Sisimiut 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 Sisimiut is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sisimiut 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 Sisimiut 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. |
