Average Weather in May in Sisimiut Greenland
Daily high temperatures increase by 10°F, from 31°F to 41°F, rarely falling below 21°F or exceeding 49°F.
Daily low temperatures increase by 9°F, from 23°F to 32°F, rarely falling below 13°F or exceeding 38°F.
For reference, on July 24, 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.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
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 month of May in Sisimiut experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 68% to 59%.
The clearest day of the month is May 31, 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 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 41%.
Cloud Cover Categories in May
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A 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 May is gradually decreasing, starting the month at 17% and ending it at 15%.
For reference, the year's highest daily chance of a wet day is 28% on August 15, and its lowest chance is 7% on February 16.
Over the course of May in Sisimiut, the chance of a day with only rain increases from 7% to 12%, the chance of a day with mixed snow and rain decreases from 4% to 2%, and the chance of a day with only snow decreases from 6% to 1%.
Probability of Precipitation in May
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 May in Sisimiut is gradually increasing, starting the month at 0.7 inches, when it rarely exceeds 1.7 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.5 inches or falls below 0.1 inches.
Average Monthly Rainfall in May
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during May in Sisimiut is gradually decreasing, starting the month at 0.4 inches, when it rarely exceeds 0.9 inches or falls below 0.1 inches, and ending the month at 0.1 inches, when it rarely exceeds 0.3 inches.
Average Monthly Liquid-Equivalent Snowfall in May
Due 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.
Neither polar day nor polar night occur during the month of May.
Over the course of May in Sisimiut, the length of the day is very rapidly increasing. From the start to the end of the month, the length of the day increases by 5 hours, 13 minutes, implying an average daily increase of 10 minutes, 26 seconds, and weekly increase of 1 hour, 13 minutes, 1 second.
The shortest day of the month is May 1, with 17 hours, 43 minutes of daylight and the longest day is May 31, with 22 hours, 56 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Sisimiut is 4:41 AM on May 1 and the earliest sunrise is 2 hours, 32 minutes earlier at 2:10 AM on May 31.
The earliest sunset is 10:24 PM on May 1 and the latest sunset is 2 hours, 41 minutes later at 1:05 AM on May 31.
Daylight saving time is observed in Sisimiut during 2021, but it neither starts nor ends during May, so the entire month is in daylight saving time.
Sunrise & Sunset with Twilight in May
The figure below presents a compact representation of key lunar data for May 2021. 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.
Moon Rise, Set & Phases in May
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 Sisimiut is essentially constant during May, remaining around 0% throughout.
Humidity Comfort Levels in May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Sisimiut is decreasing during May, decreasing from 9.3 miles per hour to 7.9 miles per hour over the course of the month.
For reference, on December 3, the windiest day of the year, the daily average wind speed is 10.9 miles per hour, while on July 14, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.
Average Wind Speed in May
The hourly average wind direction in Sisimiut throughout May is predominantly from the north, with a peak proportion of 44% on May 4.
Wind Direction in May
Sisimiut 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 gradually increasing during May, rising by 2°F, from 32°F to 34°F, over the course of the month.
Average Water Temperature in May
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).
The growing season in Sisimiut typically lasts for 3.3 months (102 days), from around June 13 to around September 23, rarely starting before May 25 or after July 5, and rarely ending before September 4 or after October 11.
The month of May in Sisimiut is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season increasing from 0% to 20% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in May
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
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 May, remaining around 0°F throughout.
Growing Degree Days in May
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 Sisimiut is increasing during May, rising by 1.4 kWh, from 4.3 kWh to 5.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For 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%).
This 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 Point
There 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: Sisimiut /Holsteins (75%, 2.5 kilometers, south) and Sisimiut Airport (25%, 2.8 kilometers, northwest).
All 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 © 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.