Average Weather in December in Tromsø Norway
In Tromsø, the month of December is characterized by gradually falling daily high temperatures, with daily highs decreasing by 3°F, from 33°F to 30°F over the course of the month, and rarely exceeding 42°F or dropping below 19°F.
Daily low temperatures decrease by 4°F, from 25°F to 22°F, rarely falling below 10°F or exceeding 35°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 December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Tromsø experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 79% throughout the month. The highest chance of overcast or mostly cloudy conditions is 80% on December 14.
The clearest day of the month is December 3, with clear, mostly clear, or partly cloudy conditions 22% 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 Categories in December
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 December is essentially constant, remaining around 45% throughout.
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 December in Tromsø, the chance of a day with only rain decreases from 20% to 14%, the chance of a day with mixed snow and rain remains an essentially constant 10% throughout, and the chance of a day with only snow increases from 14% to 19%.
Probability of Precipitation in December
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 December in Tromsø is gradually decreasing, starting the month at 2.2 inches, when it rarely exceeds 4.1 inches or falls below 0.7 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.9 inches or falls below 0.2 inches.
Average Monthly Rainfall in December
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 December in Tromsø is gradually increasing, starting the month at 1.1 inches, when it rarely exceeds 2.5 inches or falls below 0.1 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.7 inches or falls below 0.3 inches.
Average Monthly Liquid-Equivalent Snowfall in December
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 2017, the Sun is continuously below the horizon for 1.6 months, setting at 12:01 PM on November 26, and not rising again until 11:26 AM on January 15. As such, the sun is continuously below the horizon for the entire month of December.
Hours of Daylight and Twilight in December
Daylight saving time is observed in Tromsø during 2017, but it neither starts nor ends during December, so the entire month is in standard time.
Sunrise & Sunset with Twilight in December
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 December, 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 December
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 essentially constant during December, remaining within 0.2 miles per hour of 5.5 miles per hour throughout.
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 December
Wind Direction in December
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 essentially constant during December, remaining within 1°F of 43°F throughout.
Average Water Temperature in December
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 essentially constant during December, remaining around 0.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in December
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.