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Fall Weather in Longyearbyen Svalbard & Jan Mayen

Daily high temperatures decrease by 21°F, from 41°F to 19°F, rarely falling below 2°F or exceeding 47°F.

Daily low temperatures decrease by 25°F, from 35°F to 10°F, rarely falling below -7°F or exceeding 41°F.

For reference, on July 21, the hottest day of the year, temperatures in Longyearbyen typically range from 41°F to 47°F, while on February 18, the coldest day of the year, they range from 3°F to 14°F.

Average High and Low Temperature in the Fall in Longyearbyen

Average High and Low Temperature in the Fall in LongyearbyenSepOctNov-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°FSummerWinterSep 141°FSep 141°F35°F35°FNov 3019°FNov 3019°F10°F10°FOct 132°FOct 132°F25°F25°FNov 122°FNov 122°F14°F14°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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.

Average Hourly Temperature in the Fall in Longyearbyen

Average Hourly Temperature in the Fall in LongyearbyenSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinterfrigidfreezingvery cold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Big Sky, Montana, United States (3,629 miles away); Sŭngjibaegam, North Korea (3,749 miles); and Sinegorsk, Russia (3,500 miles) are the far-away foreign places with temperatures most similar to Longyearbyen (view comparison).

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The fall in Longyearbyen experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 72% to 88%.

The clearest day of the fall is September 7, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on January 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on May 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 40%.

Cloud Cover Categories in the Fall in Longyearbyen

Cloud Cover Categories in the Fall in LongyearbyenSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterSep 128%Sep 128%Nov 3012%Nov 3012%Oct 125%Oct 125%Nov 117%Nov 117%clearpartly cloudymostly cloudyovercastmostly clear
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Longyearbyen, the chance of a wet day over the course of the fall is gradually decreasing, starting the season at 25% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 27% on September 24, and its lowest chance is 9% on May 28.

Over the course of the fall in Longyearbyen, the chance of a day with only rain decreases from 24% to 3%, the chance of a day with mixed snow and rain increases from 1% to 6%, and the chance of a day with only snow increases from 0% to 12%.

Probability of Precipitation in the Fall in Longyearbyen

Probability of Precipitation in the Fall in LongyearbyenSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%SummerWinterSep 2427%Sep 2427%Sep 125%Sep 125%Nov 3022%Nov 3022%Nov 124%Nov 124%snowmixedrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 Longyearbyen is decreasing, starting the season at 1.4 inches, when it rarely exceeds 2.6 inches or falls below 0.3 inches, and ending the season at 0.5 inches, when it rarely exceeds 1.2 inches or falls below -0.0 inches.

The highest average 31-day accumulation is 1.4 inches on September 11.

Average Monthly Rainfall in the Fall in Longyearbyen

Average Monthly Rainfall in the Fall in LongyearbyenSepOctNov0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inSummerWinterSep 101.4 inSep 101.4 inNov 300.5 inNov 300.5 inOct 11.1 inOct 11.1 inNov 10.5 inNov 10.5 in
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.

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 Longyearbyen is very rapidly increasing, starting the season at 0.5 inches, when it rarely exceeds 1.8 inches or falls below -0.0 inches, and ending the season at 9.2 inches, when it rarely exceeds 16.8 inches or falls below 2.4 inches.

Average Monthly Snowfall in the Fall in Longyearbyen

Average Monthly Snowfall in the Fall in LongyearbyenSepOctNov0 in0 in5 in5 in10 in10 in15 in15 in20 in20 inSummerWinterSep 10.5 inSep 10.5 inNov 309.2 inNov 309.2 inOct 14.6 inOct 14.6 inNov 19.2 inNov 19.2 in
The average snowfall (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 rainfall.

Due to its extreme latitude, Longyearbyen 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 Longyearbyen during 2024, the Sun is continuously below the horizon for 3.7 months, setting at 1:29 PM on October 25, and not rising again until 11:30 AM on February 16. 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 18 hours, 26 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Longyearbyen

Hours of Daylight and Twilight in the Fall in LongyearbyenSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 34 minSep 2212 hr, 34 minSep 118 hr, 26 minSep 118 hr, 26 minNov 300 minNov 300 minNov 10 minNov 10 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the fall in Longyearbyen is 3:40 AM on September 1 and the latest sunrise is 8 hours, 11 minutes later at 11:50 AM on October 25.

The latest sunset is 10:06 PM on September 1 and the earliest sunset is 8 hours, 37 minutes earlier at 1:29 PM on October 25.

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

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Longyearbyen

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in LongyearbyenSepOctNov12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter11:50 AM11:50 AM3:40 AM3:40 AM10:06 PMSep 110:06 PMSep 17:36 AM7:36 AM5:54 PMOct 15:54 PMOct 1SolarMidnightSolarMidnightSolarNoon
The solar day in the fall. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

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 Fall in Longyearbyen

Solar Elevation and Azimuth in the Fall in LongyearbyenSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinter010
northeastsouthwest
Solar elevation and azimuth in the the fall 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).

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.

Moon Rise, Set & Phases in the Fall in Longyearbyen

Moon Rise, Set & Phases in the Fall in LongyearbyenSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 41:14 PMAug 41:14 PMSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AMOct 28:50 PMOct 28:50 PMOct 171:27 PMOct 171:27 PMNov 1510:29 PMNov 1510:29 PMDec 1510:02 AMDec 1510:02 AM12:00 AM12:00 AM12:00 AM12:00 AM3:20 AM3:20 AM9:18 PM9:18 PM8:18 PM8:18 PM6:15 AM6:15 AM6:41 AM6:41 AM5:32 PM5:32 PM1:55 PM1:55 PM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Longyearbyen is essentially constant during the fall, remaining around 0% throughout.

Humidity Comfort Levels in the Fall in Longyearbyen

Humidity Comfort Levels in the Fall in LongyearbyenSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterOct 160%Oct 160%Sep 10%Sep 10%Nov 300%Nov 300%Oct 10%Oct 10%Nov 10%Nov 10%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Longyearbyen is rapidly increasing during the fall, increasing from 8.1 miles per hour to 12.0 miles per hour over the course of the season.

For reference, on January 2, the windiest day of the year, the daily average wind speed is 13.3 miles per hour, while on June 20, the calmest day of the year, the daily average wind speed is 7.4 miles per hour.

Average Wind Speed in the Fall in Longyearbyen

Average Wind Speed in the Fall in LongyearbyenSepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphSummerWinterSep 18.1 mphSep 18.1 mphNov 3012.0 mphNov 3012.0 mphOct 19.7 mphOct 19.7 mphNov 110.7 mphNov 110.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Longyearbyen throughout the fall is predominantly from the east, with a peak proportion of 44% on November 16.

Wind Direction in the Fall in Longyearbyen

Wind Direction in the Fall in LongyearbyenSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWinterwesteastnorthsouth
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).

Longyearbyen 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 Longyearbyen is decreasing during the fall, falling by 6°F, from 38°F to 32°F, over the course of the season.

Average Water Temperature in the Fall in Longyearbyen

Average Water Temperature in the Fall in LongyearbyenSepOctNov30°F30°F32°F32°F34°F34°F36°F36°F38°F38°F40°F40°F42°F42°F44°F44°FSummerWinterSep 138°FSep 138°FNov 3032°FNov 3032°FOct 135°FOct 135°FNov 133°FNov 133°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Longyearbyen typically lasts for 2.5 months (76 days), from around June 13 to around August 29, rarely starting before May 28 or after June 30, and rarely ending before August 9 or after September 16.

The fall in Longyearbyen 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 41% to -0% over the course of the season.

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Longyearbyen

Time Spent in Various Temperature Bands and the Growing Season in the Fall in LongyearbyenSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterSep 141%Sep 141%Nov 30-0%Nov 30-0%Oct 1-0%Oct 1-0%Nov 1-0%Nov 1-0%50%Aug 2950%Aug 2990%Aug 990%Aug 9frigidfreezingvery coldcold
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 Longyearbyen are essentially constant during the fall, remaining around 8°F throughout.

Growing Degree Days in the Fall in Longyearbyen

Growing Degree Days in the Fall in LongyearbyenSepOctNov2°F2°F4°F4°F6°F6°F8°F8°F10°F10°F12°F12°F14°F14°F16°F16°F18°F18°FSummerWinterSep 18°FSep 18°FNov 309°FNov 309°FOct 19°FOct 19°FNov 19°FNov 19°F
The average growing degree days accumulated over the course of the fall, with 25th to 75th and 10th to 90th percentile bands.

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 Longyearbyen is rapidly decreasing during the fall, falling by 1.7 kWh, from 1.7 kWh to 0.0 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Fall in Longyearbyen

Average Daily Incident Shortwave Solar Energy in the Fall in LongyearbyenSepOctNov0.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWhSummerWinterSep 11.7 kWhSep 11.7 kWhNov 300.0 kWhNov 300.0 kWhOct 10.4 kWhOct 10.4 kWhNov 10.0 kWhNov 10.0 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Longyearbyen are 78.223 deg latitude, 15.647 deg longitude, and 20 ft elevation.

The topography within 2 miles of Longyearbyen contains very significant variations in elevation, with a maximum elevation change of 1,594 feet and an average elevation above sea level of 358 feet. Within 10 miles contains very significant variations in elevation (3,448 feet). Within 50 miles also contains extreme variations in elevation (4,160 feet).

The area within 2 miles of Longyearbyen is covered by snow and glaciers (36%), water (35%), and sparse vegetation (25%), within 10 miles by snow and glaciers (50%) and water (30%), and within 50 miles by snow and glaciers (60%) and water (28%).

This report illustrates the typical weather in Longyearbyen, 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, Svalbard Airport, Longyear, in our network suitable to be used as a proxy for the historical temperature and dew point records of Longyearbyen.

At a distance of 5 kilometers from Longyearbyen, 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 Longyearbyen 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.

Other Data

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 © OpenStreetMap contributors.

Disclaimer

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.

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