Average Weather at Tromsø Airport, Langnes Norway

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At Tromsø Airport, Langnes, the summers are short, cool, and mostly cloudy and the winters are long, freezing, windy, and overcast. Over the course of the year, the temperature typically varies from 21°F to 59°F and is rarely below 10°F or above 69°F.

The warm season lasts for 2.7 months, from June 14 to September 5, with an average daily high temperature above 53°F. The hottest day of the year is July 24, with an average high of 59°F and low of 48°F.

The cold season lasts for 4.7 months, from November 13 to April 3, with an average daily high temperature below 35°F. The coldest day of the year is January 25, with an average low of 21°F and high of 29°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

At Tromsø Airport, Langnes, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Tromsø Airport, Langnes begins around April 17 and lasts for 5.4 months, ending around September 29. On May 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 44% of the time, and overcast or mostly cloudy 56% of the time.

The cloudier part of the year begins around September 29 and lasts for 6.6 months, ending around April 17. On December 13, the cloudiest day of the year, the sky is overcast or mostly cloudy 80% of the time, and clear, mostly clear, or partly cloudy 20% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Tromsø Airport, Langnes varies throughout the year.

The wetter season lasts 5.4 months, from September 4 to February 15, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 49% on October 21.

The drier season lasts 6.6 months, from February 15 to September 4. The smallest chance of a wet day is 32% on May 29.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation at Tromsø Airport, Langnes changes throughout the year.

Rain alone is the most common for 9.9 months, from February 28 to December 25. The highest chance of a day with rain alone is 45% on September 30.

Snow alone is the most common for 2.1 months, from December 25 to February 28. The highest chance of a day with snow alone is 18% on January 28.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Tromsø Airport, Langnes experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Tromsø Airport, Langnes. The most rain falls during the 31 days centered around October 10, with an average total accumulation of 3.7 inches.

The least rain falls around March 27, with an average total accumulation of 1.6 inches.

Snowfall

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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Tromsø Airport, Langnes experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.3 months, from October 1 to May 10, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 31, with an average total liquid-equivalent accumulation of 1.7 inches.

The snowless period of the year lasts for 4.7 months, from May 10 to October 1. The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches.

Due to its extreme latitude, Tromsø Airport, Langnes 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 summer at Tromsø Airport, Langnes during 2017, the Sun is continuously above the horizon for 2.3 months, rising at 1:10 AM on May 17, and not setting again until 12:40 AM on July 26.

In the winter at Tromsø Airport, Langnes during 2017, the Sun is continuously below the horizon for 1.6 months, setting at 11:58 AM on November 26, and not rising again until 11:30 AM on January 15.

Daylight saving time (DST) is observed at Tromsø Airport, Langnes during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

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 perceived humidity level at Tromsø Airport, Langnes, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 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 Tromsø Airport, Langnes experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 19 to April 26, with average wind speeds of more than 4.5 miles per hour. The windiest day of the year is January 30, with an average hourly wind speed of 6.2 miles per hour.

The calmer time of year lasts for 5.8 months, from April 26 to October 19. The calmest day of the year is August 1, with an average hourly wind speed of 2.9 miles per hour.

The predominant average hourly wind direction at Tromsø Airport, Langnes varies throughout the year.

The wind is most often from the east for 3.0 weeks, from May 11 to June 1, with a peak percentage of 31% on May 21. The wind is most often from the west for 2.8 months, from June 1 to August 26, with a peak percentage of 34% on July 19. The wind is most often from the south for 8.5 months, from August 26 to May 11, with a peak percentage of 46% on January 1.

Tromsø Airport, Langnes 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.5 months, from July 8 to September 22, with an average temperature above 49°F. The day of the year with the warmest water is August 11, with an average temperature of 52°F.

The time of year with cooler water lasts for 4.1 months, from January 9 to May 13, with an average temperature below 41°F. The day of the year with the coolest water is March 24, with an average temperature of 39°F.

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.6 months, from May 11 to July 31, with an average daily incident shortwave energy per square meter above 4.1 kWh. The brightest day of the year is June 16, with an average of 5.3 kWh.

The darker period of the year lasts for 5.5 months, from September 29 to March 13, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest day of the year is January 1, with an average of 0.0 kWh.

For the purposes of this report, the geographical coordinates of Tromsø Airport, Langnes are 69.683 deg latitude, 18.917 deg longitude, and 16 ft elevation.

The topography within 2 miles of Tromsø Airport, Langnes contains very significant variations in elevation, with a maximum elevation change of 837 feet and an average elevation above sea level of 113 feet. Within 10 miles contains very significant 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 Airport, Langnes is covered by water (32%), trees (30%), and artificial surfaces (28%), within 10 miles by water (23%) and sparse vegetation (22%), and within 50 miles by water (46%) and trees (18%).

This report illustrates the typical weather at Tromsø Airport, Langnes, 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

Tromsø Airport, Langnes has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Bardufoss Airport, Sørkjosen Airport, Evenes, Andøya Andenes Airport, and Alta Lufthavn.

Other Data

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.