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Winter Weather in Grytviken South Georgia & South Sandwich Islands

Daily high temperatures are around 32°F, rarely falling below 25°F or exceeding 36°F. The lowest daily average high temperature is 31°F on July 22.

Daily low temperatures are around 28°F, rarely falling below 19°F or exceeding 33°F. The lowest daily average low temperature is 26°F on July 23.

For reference, on February 24, the hottest day of the year, temperatures in Grytviken typically range from 36°F to 40°F, while on July 23, the coldest day of the year, they range from 26°F to 31°F.

Average High and Low Temperature in the Winter in Grytviken

Average High and Low Temperature in the Winter in GrytvikenJunJulAug15°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°FFallSpringJul 2231°FJul 2231°F26°F26°FJun 133°FJun 133°F29°F29°FAug 3131°FAug 3131°F27°F27°FJul 131°FJul 131°F27°F27°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 winter 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 Winter in Grytviken

Average Hourly Temperature in the Winter in GrytvikenJunJulAug12 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 AMFallSpringfreezingvery 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.

Nanortalik, Greenland (7,929 miles away) is the far-away foreign place with temperatures most similar to Grytviken (view comparison).

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The winter in Grytviken experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 76% throughout the season. The highest chance of overcast or mostly cloudy conditions is 79% on June 20.

The clearest day of the winter is August 31, with clear, mostly clear, or partly cloudy conditions 27% of the time.

For reference, on June 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on December 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 37%.

Cloud Cover Categories in the Winter in Grytviken

Cloud Cover Categories in the Winter in GrytvikenJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringDec 1537%Dec 1537%Jun 123%Jun 123%Aug 3127%Aug 3127%Jul 122%Jul 122%Aug 123%Aug 123%partly cloudymostly cloudyovercastmostly clearclear
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 Grytviken, the chance of a wet day over the course of the winter is decreasing, starting the season at 32% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 44% on January 26, and its lowest chance is 21% on October 4.

Over the course of the winter in Grytviken, the chance of a day with only rain decreases from 19% to 9%, the chance of a day with mixed snow and rain remains an essentially constant 9% throughout, and the chance of a day with only snow increases from 6% to 9%.

Probability of Precipitation in the Winter in Grytviken

Probability of Precipitation in the Winter in GrytvikenJunJulAug0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%FallSpringJun 132%Jun 132%Aug 3127%Aug 3127%Jul 129%Jul 129%Aug 126%Aug 126%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 winter in Grytviken is decreasing, starting the season at 1.4 inches, when it rarely exceeds 2.5 inches or falls below 0.6 inches, and ending the season at 0.8 inches, when it rarely exceeds 1.6 inches or falls below 0.2 inches.

The lowest average 31-day accumulation is 0.7 inches on August 3.

Average Monthly Rainfall in the Winter in Grytviken

Average Monthly Rainfall in the Winter in GrytvikenJunJulAug0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inFallSpringAug 30.7 inAug 30.7 inJun 11.4 inJun 11.4 inAug 310.8 inAug 310.8 inJul 11.1 inJul 11.1 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 winter in Grytviken is increasing, starting the season at 3.8 inches, when it rarely exceeds 7.9 inches or falls below 0.3 inches, and ending the season at 6.2 inches, when it rarely exceeds 10.2 inches or falls below 1.9 inches.

Average Monthly Snowfall in the Winter in Grytviken

Average Monthly Snowfall in the Winter in GrytvikenJunJulAug0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inFallSpringJun 13.8 inJun 13.8 inAug 316.2 inAug 316.2 inJul 15.0 inJul 15.0 inAug 15.3 inAug 15.3 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.

Over the course of the winter in Grytviken, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 2 hours, 59 minutes, implying an average daily increase of 1 minute, 58 seconds, and weekly increase of 13 minutes, 47 seconds.

The shortest day of the winter is June 20, with 7 hours, 19 minutes of daylight and the longest day is August 31, with 10 hours, 38 minutes of daylight.

Hours of Daylight and Twilight in the Winter in Grytviken

Hours of Daylight and Twilight in the Winter in GrytvikenJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringJun 207 hr, 19 minJun 207 hr, 19 mindaydaydaydaynightAug 3110 hr, 38 minAug 3110 hr, 38 minAug 18 hr, 41 minAug 18 hr, 41 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 latest sunrise of the winter in Grytviken is 8:48 AM on June 24 and the earliest sunrise is 1 hour, 41 minutes earlier at 7:07 AM on August 31.

The earliest sunset is 4:06 PM on June 16 and the latest sunset is 1 hour, 39 minutes later at 5:45 PM on August 31.

Daylight saving time is not observed in Grytviken during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 3:48 AM and sets 17 hours, 13 minutes later, at 9:00 PM, while on June 20, the shortest day of the year, it rises at 8:48 AM and sets 7 hours, 19 minutes later, at 4:07 PM.

Sunrise & Sunset with Twilight in the Winter in Grytviken

Sunrise & Sunset with Twilight in the Winter in GrytvikenJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring7:07 AM7:07 AMAug 315:45 PMAug 315:45 PM8:46 AM8:46 AMJun 164:06 PMJun 164:06 PM8:12 AM8:12 AMAug 14:53 PMAug 14:53 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the winter. 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 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 Winter in Grytviken

Solar Elevation and Azimuth in the Winter in GrytvikenJunJulAug12 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 AMFallSpring00102000101030
northeastsouthwest
Solar elevation and azimuth in the the winter 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 winter 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 Winter in Grytviken

Moon Rise, Set & Phases in the Winter in GrytvikenJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringMay 81:23 AMMay 81:23 AMMay 2311:54 AMMay 2311:54 AMJun 610:38 AMJun 610:38 AMJun 2111:09 PMJun 2111:09 PMJul 58:58 PMJul 58:58 PMJul 218:18 AMJul 218:18 AMAug 49:14 AMAug 49:14 AMAug 194:26 PMAug 194:26 PMSep 211:56 PMSep 211:56 PMSep 1812:35 AMSep 1812:35 AM8:48 AM8:48 AM4:29 PM4:29 PM9:21 AM9:21 AM3:27 PM3:27 PM2:55 PM2:55 PM9:19 AM9:19 AM3:09 PM3:09 PM2:54 PM2:54 PM9:19 AM9:19 AM8:46 AM8:46 AM4:52 PM4:52 PM5:05 PM5:05 PM8:12 AM8:12 AM5:14 PM5:14 PM5:40 PM5:40 PM6:38 AM6:38 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 Grytviken is essentially constant during the winter, remaining around 0% throughout.

Humidity Comfort Levels in the Winter in Grytviken

Humidity Comfort Levels in the Winter in GrytvikenJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringJun 10%Jun 10%Aug 310%Aug 310%Jul 10%Jul 10%Aug 10%Aug 10%drydry
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 Grytviken is increasing during the winter, increasing from 18.4 miles per hour to 20.0 miles per hour over the course of the season.

For reference, on August 28, the windiest day of the year, the daily average wind speed is 20.3 miles per hour, while on December 21, the calmest day of the year, the daily average wind speed is 17.0 miles per hour.

The highest daily average wind speed during the winter is 20.3 miles per hour on August 28.

Average Wind Speed in the Winter in Grytviken

Average Wind Speed in the Winter in GrytvikenJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphFallSpringAug 2820.3 mphAug 2820.3 mphJun 118.4 mphJun 118.4 mphJul 119.4 mphJul 119.4 mphAug 119.7 mphAug 119.7 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 Grytviken throughout the winter is predominantly from the west, with a peak proportion of 54% on August 7.

Wind Direction in the Winter in Grytviken

Wind Direction in the Winter in GrytvikenJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%FallSpringwestsouthnortheast
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).

Grytviken 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 Grytviken is gradually decreasing during the winter, falling by 2°F, from 35°F to 32°F, over the course of the season.

Average Water Temperature in the Winter in Grytviken

Average Water Temperature in the Winter in GrytvikenJunJulAug31°F31°F32°F32°F33°F33°F34°F34°F35°F35°F36°F36°F37°F37°F38°F38°FFallSpringJun 135°FJun 135°FAug 3132°FAug 3132°FJul 133°FJul 133°FAug 133°FAug 133°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 Grytviken typically lasts for 2.6 months (76 days), from around December 30 to around March 17, rarely starting before December 2, or ending after April 20.

The winter in Grytviken is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Grytviken

Time Spent in Various Temperature Bands and the Growing Season in the Winter in GrytvikenJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring-0%Jul 17-0%Jul 17freezingvery 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.

The average accumulated growing degree days in Grytviken are essentially constant during the winter, remaining around 0°F throughout.

Growing Degree Days in the Winter in Grytviken

Growing Degree Days in the Winter in GrytvikenJunJulAug0.0°F0.0°F0.1°F0.1°F0.2°F0.2°F0.3°F0.3°F0.4°F0.4°F0.5°F0.5°F0.6°F0.6°F0.7°F0.7°F0.8°F0.8°F0.9°F0.9°F1.0°F1.0°FFallSpringJun 10°FJun 10°FAug 310°FAug 310°FJul 10°FJul 10°FAug 10°FAug 10°F
The average growing degree days accumulated over the course of the winter, 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 Grytviken is increasing during the winter, rising by 1.1 kWh, from 0.4 kWh to 1.5 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 0.4 kWh on June 20.

Average Daily Incident Shortwave Solar Energy in the Winter in Grytviken

Average Daily Incident Shortwave Solar Energy in the Winter in GrytvikenJunJulAug0.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWhFallSpringJun 200.4 kWhJun 200.4 kWhJun 10.4 kWhJun 10.4 kWhAug 311.5 kWhAug 311.5 kWhAug 10.7 kWhAug 10.7 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 Grytviken are -54.281 deg latitude, -36.509 deg longitude, and 13 ft elevation.

The topography within 2 miles of Grytviken contains very significant variations in elevation, with a maximum elevation change of 1,926 feet and an average elevation above sea level of 570 feet. Within 10 miles contains very significant variations in elevation (7,513 feet). Within 50 miles also contains extreme variations in elevation (9,669 feet).

The area within 2 miles of Grytviken is covered by snow and glaciers (51%), water (24%), and shrubs (11%), within 10 miles by snow and glaciers (52%) and water (43%), and within 50 miles by water (83%) and snow and glaciers (16%).

This report illustrates the typical weather in Grytviken, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Grytviken is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.

The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Grytviken, according to the International Standard Atmosphere .

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.

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.

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.

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