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Average Weather at Bjornoya Svalbard & Jan Mayen

At Bjornoya, the summers are short, very cold, dry, and windy; the winters are long, freezing, snowy, and extremely windy; and it is overcast year round. Over the course of the year, the temperature typically varies from 18°F to 45°F and is rarely below -1°F or above 50°F.

Based on the tourism score, the best time of year to visit Bjornoya for warm-weather activities is from late July to mid August.

Climate Summary

freezingvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow30%30%9%9%overcastprecipitation: 1.5 inprecipitation: 1.5 in0.6 in0.6 inmuggy: 0%muggy: 0%drydrytourism score: 0.1tourism score: 0.10.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 2.7 months, from June 25 to September 16, with an average daily high temperature above 41°F. The hottest day of the year is August 2, with an average high of 45°F and low of 40°F.

The cold season lasts for 4.8 months, from November 27 to April 21, with an average daily high temperature below 30°F. The coldest day of the year is February 7, with an average low of 18°F and high of 26°F.

Average High and Low Temperature

Average High and Low Temperature at BjornoyawarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 726°FFeb 726°FAug 245°FAug 245°F18°F18°F40°F40°FJun 2541°FJun 2541°FSep 1641°FSep 1641°FNov 2730°FNov 2730°FApr 2130°FApr 2130°F36°F36°F36°F36°F23°F23°F23°F23°FNowNow
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 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.

Average Hourly Temperature

Average Hourly Temperature at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery 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.

King Cove, Alaska, United States (3,487 miles away); Diamond Ridge, Alaska, United States (3,158 miles); and Petropavlovsk-Kamchatsky, Russia (3,432 miles) are the far-away foreign places with temperatures most similar to Bjornoya (view comparison).

Clouds

At Bjornoya, 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 Bjornoya begins around April 27 and lasts for 2.4 months, ending around July 8. On May 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 30% of the time, and overcast or mostly cloudy 70% of the time.

The cloudier part of the year begins around July 8 and lasts for 9.6 months, ending around April 27. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 91% of the time, and clear, mostly clear, or partly cloudy 9% of the time.

Cloud Cover Categories

Cloud Cover Categories at BjornoyaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2830%May 2830%Jan 219%Jan 219%Jul 819%Jul 819%NowNowclearpartly 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.

Precipitation

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

The wetter season lasts 7.6 months, from August 30 to April 19, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 27% on January 17.

The drier season lasts 4.4 months, from April 19 to August 30. The smallest chance of a wet day is 10% on June 5.

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 Bjornoya changes throughout the year.

Rain alone is the most common for 7.2 months, from April 27 to December 1. The highest chance of a day with rain alone is 21% on September 16.

Snow alone is the most common for 4.8 months, from December 1 to April 27. The highest chance of a day with snow alone is 16% on January 17.

Daily Chance of Precipitation

Daily Chance of Precipitation at BjornoyasnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 1727%Jan 1727%Jun 510%Jun 510%Apr 2716%Apr 2716%Dec 124%Dec 124%Aug 3018%Aug 3018%NowNowsnowrainmixed
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 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. Bjornoya experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.0 months, from April 24 to December 25, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 26, with an average total accumulation of 1.2 inches.

The rainless period of the year lasts for 4.0 months, from December 25 to April 24. The least rain falls around February 6, with an average total accumulation of 0.4 inches.

Average Monthly Rainfall

Average Monthly Rainfall at BjornoyarainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inSep 261.2 inSep 261.2 inFeb 60.4 inFeb 60.4 inJul 190.9 inJul 190.9 inApr 250.5 inApr 250.5 inDec 250.5 inDec 250.5 inNowNow
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 liquid-equivalent snowfall.

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. Bjornoya experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 8.1 months, from September 29 to June 2, 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 15, with an average total liquid-equivalent accumulation of 0.9 inches.

The snowless period of the year lasts for 3.9 months, from June 2 to September 29. The least snow falls around August 1, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at BjornoyasnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inJan 150.9 inJan 150.9 inAug 10.0 inAug 10.0 inSep 290.1 inSep 290.1 inJun 20.1 inJun 20.1 in
The average liquid-equivalent 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.

Sun

Due to its extreme latitude, Bjornoya 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 Bjornoya during 2021, the Sun is continuously above the horizon for 3.5 months, rising at 1:18 AM on April 29, and not setting again until 12:04 AM on August 14.

In the winter at Bjornoya during 2021, the Sun is continuously below the horizon for 2.9 months, setting at 12:05 PM on November 6, and not rising again until 11:18 AM on February 4.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Bjornoyapolar daypolar nightJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 14 minMar 2012 hr, 14 minMar 2024 hr, 0 minJun 2124 hr, 0 minJun 2112 hr, 29 minSep 2212 hr, 29 minSep 220 minDec 210 minDec 21nightnightdayNowNow
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.

Daylight saving time (DST) is observed at Bjornoya during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMApr 291:18 AMApr 291:18 AM12:04 AMAug 1312:04 AMAug 1312:05 PMNov 612:05 PMNov 6Feb 411:18 AMFeb 411:18 AMMar 28DSTMar 28DSTdaynightnightnightnightSolarMidnightSolarMidnightSolarNoonNowNow
The solar day over the course of the year 2021. 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.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases

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.

Humidity

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 Bjornoya, 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.

Humidity Comfort Levels

Humidity Comfort Levels at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 30%Jul 30%NowNowdrydry
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.

Wind

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 Bjornoya experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 6.9 months, from September 30 to April 27, with average wind speeds of more than 16.3 miles per hour. The windiest day of the year is January 23, with an average hourly wind speed of 21.0 miles per hour.

The calmer time of year lasts for 5.1 months, from April 27 to September 30. The calmest day of the year is July 27, with an average hourly wind speed of 11.7 miles per hour.

Average Wind Speed

Average Wind Speed at BjornoyawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphJan 2321.0 mphJan 2321.0 mphJul 2711.7 mphJul 2711.7 mphSep 3016.3 mphSep 3016.3 mphApr 2716.3 mphApr 2716.3 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Bjornoya varies throughout the year.

The wind is most often from the west for 2.4 weeks, from June 24 to July 11, with a peak percentage of 32% on July 9. The wind is most often from the east for 4.9 months, from July 11 to December 9 and for 6.1 months, from December 22 to June 24, with a peak percentage of 35% on November 11. The wind is most often from the north for 1.9 weeks, from December 9 to December 22, with a peak percentage of 33% on December 18.

Wind Direction

Wind Direction at BjornoyaEWENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
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).

Water Temperature

Bjornoya 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 2.1 months, from July 7 to September 10, with an average temperature above 40°F. The day of the year with the warmest water is August 5, with an average temperature of 41°F.

The time of year with cooler water lasts for 6.7 months, from October 29 to May 18, with an average temperature below 36°F. The day of the year with the coolest water is January 1, with an average temperature of 35°F.

Average Water Temperature

Average Water Temperature at BjornoyawarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec32°F32°F34°F34°F36°F36°F38°F38°F40°F40°F42°F42°F44°F44°FAug 541°FAug 541°F35°FJan 135°FJan 1Jul 740°FJul 740°FSep 1040°FSep 1040°FOct 2936°FOct 2936°FMay 1836°FMay 1836°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is at Bjornoya throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Bjornoya for general outdoor tourist activities is from late July to mid August, with a peak score in the first week of August.

Tourism Score

Tourism Score at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.10.10.00.0precipitationprecipitationcloudsclouds
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Bjornoya for hot-weather activities is from mid July to mid August, with a peak score in the second week of July.

Beach/Pool Score

Beach/Pool Score at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.00.00.00.0precipitationprecipitationcloudsclouds
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 at Bjornoya typically lasts for 3.0 months (91 days), from around June 22 to around September 21, rarely starting before June 1 or after July 14, and rarely ending before August 29 or after October 11.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 2250%Jun 2250%Sep 2150%Sep 2150%Jul 1490%Jul 1490%Aug 2990%Aug 2990%Jun 110%Jun 110%Oct 1110%Oct 1110%0%Nov 290%Nov 29Aug 698%Aug 698%NowNowfrigidfreezingvery 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 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.

Growing Degree Days

Growing Degree Days at BjornoyaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F2°F2°F4°F4°F6°F6°F8°F8°F10°F10°F12°F12°FDec 316°FDec 316°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.0 months, from May 15 to July 16, with an average daily incident shortwave energy per square meter above 3.8 kWh. The brightest day of the year is June 9, with an average of 4.8 kWh.

The darker period of the year lasts for 6.2 months, from September 18 to March 24, with an average daily incident shortwave energy per square meter below 1.0 kWh. The darkest day of the year is January 1, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at BjornoyabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 94.8 kWhJun 94.8 kWhJan 10.0 kWhJan 10.0 kWhJul 163.8 kWhJul 163.8 kWhSep 181.0 kWhSep 181.0 kWhMar 241.0 kWhMar 241.0 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Bjornoya are 74.517 deg latitude, 19.017 deg longitude, and 0 ft elevation.

The topography within 2 miles of Bjornoya contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 22 feet. Within 10 miles contains only modest variations in elevation (1,673 feet). Within 50 miles also contains very significant variations in elevation (1,706 feet).

The area within 2 miles of Bjornoya is covered by water (59%), sparse vegetation (29%), and snow and glaciers (11%), within 10 miles by water (78%) and sparse vegetation (17%), and within 50 miles by water (99%).

Data Sources

This report illustrates the typical weather at Bjornoya, 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

Bjornoya 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.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.