Fall Weather in Olonkinbyen Svalbard & Jan Mayen

Daily high temperatures decrease by 13°F, from 43°F to 31°F, rarely falling below 21°F or exceeding 48°F.

Daily low temperatures decrease by 15°F, from 39°F to 24°F, rarely falling below 14°F or exceeding 44°F.

For reference, on August 5, the hottest day of the year, temperatures in Olonkinbyen typically range from 41°F to 45°F, while on March 4, the coldest day of the year, they range from 21°F to 28°F.

The figure below shows you a compact characterization of the hourly average fall 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.

King Cove, Alaska, United States (3,640 miles away) and Diamond Ridge, Alaska, United States (3,239 miles) are the far-away foreign places with temperatures most similar to Olonkinbyen (view comparison).

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The fall in Olonkinbyen experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 79% to 88%. The lowest chance of overcast or mostly cloudy conditions is 78% on September 17.

The clearest day of the fall is September 17, with clear, mostly clear, or partly cloudy conditions 22% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 89%, while on May 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 26%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Olonkinbyen, the chance of a wet day over the course of the fall is increasing, starting the season at 23% and ending it at 28%.

For reference, the year's highest daily chance of a wet day is 32% on November 4, and its lowest chance is 11% on June 16.

Over the course of the fall in Olonkinbyen, the chance of a day with only rain decreases from 23% to 13%, the chance of a day with mixed snow and rain increases from 0% to 8%, and the chance of a day with only snow increases from 0% to 8%.

Rainfall

To 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 fall in Olonkinbyen is gradually decreasing, starting the season at 1.6 inches, when it rarely exceeds 2.7 inches or falls below 0.6 inches, and ending the season at 1.3 inches, when it rarely exceeds 2.4 inches or falls below 0.4 inches.

The highest average 31-day accumulation is 2.1 inches on October 5.

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 the fall in Olonkinbyen is very rapidly increasing, starting the season at 0.0 inches, when it rarely exceeds 0.1 inches or falls below -0.0 inches, and ending the season at 7.3 inches, when it rarely exceeds 16.6 inches or falls below 1.4 inches.

Due to its extreme latitude, Olonkinbyen 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.

In the winter in Olonkinbyen during 2024, the Sun is continuously below the horizon for 2.0 months, setting at 1:33 PM on November 20, and not rising again until 1:13 PM on January 22. As such, polar night begins in the fall and lasts beyond the end of the season.

The longest day of the fall is September 1, with 15 hours, 34 minutes of daylight.

The earliest sunrise of the fall in Olonkinbyen is 6:46 AM on September 1 and the latest sunrise is 6 hours, 20 minutes later at 1:06 PM on November 20.

The latest sunset is 10:20 PM on September 1 and the earliest sunset is 8 hours, 46 minutes earlier at 1:33 PM on November 20.

Daylight saving time (DST) ends at 2:00 AM on October 27, 2024, shifting sunrise and sunset to be an hour earlier.

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 the fall 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.

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 Olonkinbyen is essentially constant during the fall, 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 in Olonkinbyen is very rapidly increasing during the fall, increasing from 14.1 miles per hour to 20.1 miles per hour over the course of the season.

For reference, on January 23, the windiest day of the year, the daily average wind speed is 21.2 miles per hour, while on July 19, the calmest day of the year, the daily average wind speed is 11.1 miles per hour.

The hourly average wind direction in Olonkinbyen throughout the fall is predominantly from the north, with a peak proportion of 47% on November 30.

Olonkinbyen 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 Olonkinbyen is rapidly decreasing during the fall, falling by 7°F, from 43°F to 35°F, over the course of the season.

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 Olonkinbyen typically lasts for 3.1 months (94 days), from around June 18 to around September 20, rarely starting before May 30 or after July 9, and rarely ending before September 2 or after October 8.

During the fall in Olonkinbyen, the chance that a given day is within the growing season is very rapidly decreasing falling from 92% to -0% over the course of the 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 Olonkinbyen are essentially constant during the fall, remaining around 1°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 in Olonkinbyen is rapidly decreasing during the fall, falling by 1.9 kWh, from 1.9 kWh to 0.0 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Olonkinbyen are 70.922 deg latitude, -8.719 deg longitude, and 164 ft elevation.

The topography within 2 miles of Olonkinbyen contains very significant variations in elevation, with a maximum elevation change of 1,765 feet and an average elevation above sea level of 519 feet. Within 10 miles contains very significant variations in elevation (2,513 feet). Within 50 miles contains large variations in elevation (7,454 feet).

The area within 2 miles of Olonkinbyen is covered by sparse vegetation (43%), water (35%), and snow and glaciers (20%), within 10 miles by water (77%) and snow and glaciers (11%), and within 50 miles by water (98%).