September Weather at Daneborg Greenland

Daily high temperatures decrease by 13°F, from 39°F to 27°F, rarely falling below 19°F or exceeding 45°F.

Daily low temperatures decrease by 12°F, from 32°F to 20°F, rarely falling below 12°F or exceeding 37°F.

For reference, on July 27, the hottest day of the year, temperatures at Daneborg typically range from 38°F to 46°F, while on February 21, the coldest day of the year, they range from -7°F to 3°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.

Palatka, Russia (3,145 miles away) is the far-away foreign place with temperatures most similar to Daneborg (view comparison).

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The month of September at Daneborg experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 51% throughout the month.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 51% of the time.

For reference, on January 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on June 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Daneborg, the chance of a wet day over the course of September is essentially constant, remaining around 15% throughout.

For reference, the year's highest daily chance of a wet day is 20% on January 4, and its lowest chance is 5% on June 11.

Over the course of September at Daneborg, the chance of a day with only rain decreases from 9% to 3%, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow increases from 2% to 9%.

Rainfall

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 September at Daneborg is decreasing, starting the month at 1.1 inches, when it rarely exceeds 2.8 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.5 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during September at Daneborg is very rapidly increasing, starting the month at 2.8 inches, when it rarely exceeds 7.6 inches, and ending the month at 9.0 inches, when it rarely exceeds 22.6 inches or falls below 0.5 inches.

Due to its extreme latitude, Daneborg 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 September.

Over the course of September at Daneborg, 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, 33 minutes, implying an average daily decrease of 11 minutes, 28 seconds, and weekly decrease of 1 hour, 20 minutes, 19 seconds.

The shortest day of the month is September 30, with 10 hours, 55 minutes of daylight and the longest day is September 1, with 16 hours, 28 minutes of daylight.

The earliest sunrise of the month at Daneborg is 4:04 AM on September 1 and the latest sunrise is 2 hours, 37 minutes later at 6:41 AM on September 30.

The latest sunset is 8:32 PM on September 1 and the earliest sunset is 2 hours, 55 minutes earlier at 5:37 PM on September 30.

Daylight saving time is observed at Daneborg during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

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.

The figure below presents a compact representation of key lunar data for September 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.

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 at Daneborg is essentially constant during September, remaining around 0% throughout.

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 at Daneborg is rapidly increasing during September, increasing from 8.2 miles per hour to 10.6 miles per hour over the course of the month.

For reference, on January 4, the windiest day of the year, the daily average wind speed is 13.4 miles per hour, while on June 11, the calmest day of the year, the daily average wind speed is 5.6 miles per hour.

The hourly average wind direction at Daneborg throughout September is predominantly from the north, with a peak proportion of 67% on September 29.

Daneborg 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 at Daneborg is gradually decreasing during September, falling by 2°F, from 33°F to 31°F, over the course of the month.

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 at Daneborg typically lasts for 1.4 months (43 days), from around July 8 to around August 21, rarely starting before June 16, or ending after September 9.

The month of September at Daneborg is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 23% to 1% over the course of the month.

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 at Daneborg are essentially constant during September, remaining around 9°F throughout.

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 at Daneborg is rapidly decreasing during September, falling by 1.9 kWh, from 2.9 kWh to 1.0 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Daneborg are 74.300 deg latitude, -20.217 deg longitude, and 46 ft elevation.

The topography within 2 miles of Daneborg contains only modest variations in elevation, with a maximum elevation change of 364 feet and an average elevation above sea level of 104 feet. Within 10 miles contains only modest variations in elevation (4,245 feet). Within 50 miles also contains extreme variations in elevation (5,640 feet).

The area within 2 miles of Daneborg is covered by sparse vegetation (44%), water (44%), and snow and glaciers (12%), within 10 miles by sparse vegetation (55%) and water (28%), and within 50 miles by water (49%) and sparse vegetation (29%).