Average Weather in October in Tromsø Norway
In Tromsø, the month of October is characterized by falling daily high temperatures, with daily highs decreasing by 9°F, from 46°F to 37°F over the course of the month, and rarely exceeding 53°F or dropping below 28°F.
Daily low temperatures decrease by 8°F, from 37°F to 29°F, rarely falling below 20°F or exceeding 45°F.
For reference, on July 24, 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 October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
The month of October in Tromsø experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 69% to 76%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 31% of the time.
For reference, on December 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on May 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 44%.
Cloud Cover in October
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 October is gradually decreasing, starting the month at 48% and ending it at 45%.
For reference, the year's highest daily chance of a wet day is 49% on October 21, and its lowest chance is 32% on May 29.
Over the course of October in Tromsø, the chance of a day with only rain decreases from 45% to 30%, the chance of a day with mixed snow and rain increases from 2% to 8%, and the chance of a day with only snow increases from 0% to 7%.
Probability of Precipitation in October
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 October in Tromsø is decreasing, starting the month at 3.7 inches, when it rarely exceeds 5.8 inches or falls below 1.9 inches, and ending the month at 3.0 inches, when it rarely exceeds 5.3 inches or falls below 0.8 inches.
The highest average 31-day accumulation is 3.7 inches on October 9.
Average Monthly Rainfall in October
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 October in Tromsø is gradually increasing, starting the month at 0.1 inches, when it rarely exceeds 0.4 inches or falls below -0.0 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.8 inches.
Average Monthly Liquid-Equivalent Snowfall in October
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.
Neither polar day nor polar night occur during the month of October.
Over the course of October in Tromsø, 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 4 hours, 25 minutes, implying an average daily decrease of 8 minutes, 51 seconds, and weekly decrease of 1 hour, 1 minute, 55 seconds.
The shortest day of the month is October 31, with 6 hours, 41 minutes of daylight and the longest day is October 1, with 11 hours, 7 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Tromsø is 6:59 AM on October 1 and the latest sunrise is 1 hour, 53 minutes later at 8:52 AM on October 28.
The latest sunset is 6:06 PM on October 1 and the earliest sunset is 3 hours, 18 minutes earlier at 2:47 PM on October 31.
Daylight saving time (DST) ends at 2:00 AM on October 29, 2017, shifting sunrise and sunset to be an hour earlier.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
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 October, remaining around 0% throughout.
For reference, on July 6, 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 October
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 gradually increasing during October, increasing from 3.8 miles per hour to 4.5 miles per hour over the course of the month.
For reference, on January 30, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in October
Wind Direction in October
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 gradually decreasing during October, falling by 3°F, from 48°F to 45°F, over the course of the month.
Average Water Temperature in October
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 gradually decreasing during October, falling by 0.8 kWh, from 1.0 kWh to 0.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Tromsø are 69.649 deg latitude, 18.955 deg longitude, and 36 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 year round, 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: Tromsø Airport, Langnes (97%, 4.0 kilometers, north); Bardufoss Airport (1.4%, 68 kilometers, south); Sørkjosen Airport (1.1%, 79 kilometers, east); and Andøya Andenes Airport (0.6%, 117 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.