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Fall Weather in Tromsø Norway

Daily high temperatures decrease by 21°F, from 54°F to 33°F, rarely falling below 23°F or exceeding 62°F.

Daily low temperatures decrease by 18°F, from 43°F to 25°F, rarely falling below 15°F or exceeding 49°F.

For reference, on July 23, the hottest day of the year, temperatures in Tromsø typically range from 48°F to 59°F, while on January 25, the coldest day of the year, they range from 21°F to 29°F.

Average High and Low Temperature in the Fall in Tromsø

Average High and Low Temperature in the Fall in TromsøSepOctNov10°F10°F15°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FSummerWinterSep 154°FSep 154°F43°F43°FNov 3033°FNov 3033°F25°F25°FOct 146°FOct 146°F37°F37°FNov 137°FNov 137°F29°F29°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 Tromsø

Average Hourly Temperature in the Fall in TromsøSepOctNov12 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 AMSummerWinterfreezingvery coldcoldcool
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.

Kodiak Station, Alaska, United States (3,627 miles away) is the far-away foreign place with temperatures most similar to Tromsø (view comparison).

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The fall in Tromsø experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 63% to 78%.

The clearest day of the fall is September 3, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on December 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on May 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 44%.

Cloud Cover Categories in the Fall in Tromsø

Cloud Cover Categories in the Fall in TromsøSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterSep 137%Sep 137%Nov 3022%Nov 3022%Oct 130%Oct 130%Nov 123%Nov 123%clearmostly clearpartly cloudymostly cloudyovercast
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 Tromsø, the chance of a wet day over the course of the fall is gradually increasing, starting the season at 40% and ending it at 44%.

For reference, the year's highest daily chance of a wet day is 49% on October 20, and its lowest chance is 32% on May 28.

Over the course of the fall in Tromsø, the chance of a day with only rain decreases from 40% to 20%, the chance of a day with mixed snow and rain increases from 0% to 9%, and the chance of a day with only snow increases from 0% to 14%.

Probability of Precipitation in the Fall in Tromsø

Probability of Precipitation in the Fall in TromsøSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%SummerWinterOct 2049%Oct 2049%Sep 140%Sep 140%Nov 3044%Nov 3044%Oct 148%Oct 148%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 Tromsø is rapidly decreasing, starting the season at 3.2 inches, when it rarely exceeds 5.7 inches or falls below 1.3 inches, and ending the season at 2.2 inches, when it rarely exceeds 4.1 inches or falls below 0.7 inches.

The highest average 31-day accumulation is 3.7 inches on October 8.

Average Monthly Rainfall in the Fall in Tromsø

Average Monthly Rainfall in the Fall in TromsøSepOctNov0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 in16 in16 inSummerWinterOct 83.7 inOct 83.7 inSep 13.2 inSep 13.2 inNov 302.2 inNov 302.2 inNov 12.9 inNov 12.9 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 Tromsø is very rapidly increasing, starting the season at 0.0 inches, when it rarely exceeds -0.0 inches or falls below -0.0 inches, and ending the season at 10.8 inches, when it rarely exceeds 24.7 inches or falls below 1.3 inches.

Average Monthly Snowfall in the Fall in Tromsø

Average Monthly Snowfall in the Fall in TromsøSepOctNov0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 in30 in30 inSummerWinterSep 10.0 inSep 10.0 inNov 3010.8 inNov 3010.8 inOct 11.3 inOct 11.3 inNov 16.4 inNov 16.4 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, Tromsø 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 Tromsø during 2024, the Sun is continuously below the horizon for 1.6 months, setting at 11:55 AM on November 26, and not rising again until 11:49 AM on January 15. 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, 19 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Tromsø

Hours of Daylight and Twilight in the Fall in TromsøSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 20 minSep 2212 hr, 20 minNov 300 minNov 300 minNov 16 hr, 29 minNov 16 hr, 29 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 Tromsø is 5:02 AM on September 1 and the latest sunrise is 6 hours, 4 minutes later at 11:07 AM on November 26.

The latest sunset is 8:22 PM on September 1 and the earliest sunset is 8 hours, 27 minutes earlier at 11:55 AM on November 26.

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 Tromsø

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in TromsøSepOctNov12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter11:07 AM11:07 AMNov 2611:55 AMNov 2611:55 AM5:02 AM5:02 AMSep 18:22 PMSep 18:22 PM7:00 AM7:00 AMOct 16:04 PMOct 16:04 PM8:12 AM8:12 AMNov 12:41 PMNov 12:41 PMSolarMidnightSolarMidnightSolarNoon
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 Tromsø

Solar Elevation and Azimuth in the Fall in TromsøSepOctNov12 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 AMSummerWinter002030010
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 Tromsø

Moon Rise, Set & Phases in the Fall in TromsøSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 41:14 PMAug 41:14 PMAug 198:26 PMAug 198:26 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 11:48 PMNov 11:48 PMNov 1510:29 PMNov 1510:29 PMDec 1510:02 AMDec 1510:02 AM11:52 PM11:52 PM4:29 AM4:29 AM5:04 AM5:04 AM8:16 PM8:16 PM7:20 PM7:20 PM6:20 AM6:20 AM6:19 AM6:19 AM5:49 PM5:49 PM4:15 PM4:15 PM8:44 AM8:44 AM1:34 PM1:34 PM12:00 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 Tromsø is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 5, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Fall in Tromsø

Humidity Comfort Levels in the Fall in TromsøSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 10%Sep 10%Nov 300%Nov 300%Oct 10%Oct 10%Nov 10%Nov 10%drydrycomfortablecomfortable
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 Tromsø is rapidly increasing during the fall, increasing from 5.9 miles per hour to 9.7 miles per hour over the course of the season.

For reference, on January 30, the windiest day of the year, the daily average wind speed is 11.1 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.

Average Wind Speed in the Fall in Tromsø

Average Wind Speed in the Fall in TromsøSepOctNov0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphSummerWinterSep 15.9 mphSep 15.9 mphNov 309.7 mphNov 309.7 mphOct 17.2 mphOct 17.2 mphNov 18.4 mphNov 18.4 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 Tromsø throughout the fall is predominantly from the south, with a peak proportion of 48% on November 17.

Wind Direction in the Fall in Tromsø

Wind Direction in the Fall in TromsøWSSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWinterwestsoutheastnorth
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).

Tromsø 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 Tromsø is decreasing during the fall, falling by 7°F, from 51°F to 44°F, over the course of the season.

Average Water Temperature in the Fall in Tromsø

Average Water Temperature in the Fall in TromsøSepOctNov38°F38°F40°F40°F42°F42°F44°F44°F46°F46°F48°F48°F50°F50°F52°F52°F54°F54°F56°F56°FSummerWinterSep 151°FSep 151°FNov 3044°FNov 3044°FOct 148°FOct 148°FNov 145°FNov 145°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 Tromsø typically lasts for 4.3 months (132 days), from around May 15 to around September 24, rarely starting before April 29 or after June 1, and rarely ending before September 3 or after October 13.

During the fall in Tromsø, the chance that a given day is within the growing season is very rapidly decreasing falling from 91% to 0% over the course of the season.

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

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Tromsøgrowing seasonSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter91%Sep 191%Sep 1Nov 300%Nov 300%Oct 132%Oct 132%Nov 10%Nov 10%frigidfreezingvery coldcoldcoolcomfortable
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 Tromsø are essentially constant during the fall, remaining within 14°F of 337°F throughout.

Growing Degree Days in the Fall in Tromsø

Growing Degree Days in the Fall in TromsøSepOctNov200°F200°F250°F250°F300°F300°F350°F350°F400°F400°F450°F450°FSummerWinterSep 1323°FSep 1323°FNov 30351°FNov 30351°FOct 1349°FOct 1349°FNov 1351°FNov 1351°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 Tromsø is very rapidly decreasing during the fall, falling by 2.5 kWh, from 2.5 kWh to 0.0 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Fall in Tromsø

Average Daily Incident Shortwave Solar Energy in the Fall in TromsøSepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWhSummerWinterSep 12.5 kWhSep 12.5 kWhNov 300.0 kWhNov 300.0 kWhOct 11.0 kWhOct 11.0 kWhNov 10.2 kWhNov 10.2 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 Tromsø are 69.649 deg latitude, 18.955 deg longitude, and 46 ft elevation.

The topography within 2 miles of Tromsø contains large variations in elevation, with a maximum elevation change of 1,982 feet and an average elevation above sea level of 209 feet. Within 10 miles contains large variations in elevation (4,003 feet). Within 50 miles also contains extreme variations in elevation (5,981 feet).

The area within 2 miles of Tromsø is covered by trees (36%), artificial surfaces (36%), and water (17%), within 10 miles by trees (22%) and sparse vegetation (22%), and within 50 miles by water (43%) and trees (19%).

This report illustrates the typical weather in Tromsø, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Tromsø.

For each station, the records are corrected for the elevation difference between that station and Tromsø 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 Tromsø is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Tromsø 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 Tromsø 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 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.

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