Spring Weather in Grytviken South Georgia & South Sandwich Islands

Daily high temperatures increase by 5°F, from 31°F to 36°F, rarely falling below 27°F or exceeding 39°F.

Daily low temperatures increase by 6°F, from 27°F to 33°F, rarely falling below 21°F or exceeding 35°F.

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 24, the coldest day of the year, they range from 26°F to 31°F.

The figure below shows you a compact characterization of the hourly average spring 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.

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 spring in Grytviken experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 73% to 65%.

The clearest day of the spring is November 30, with clear, mostly clear, or partly cloudy conditions 35% of the time.

For reference, on June 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on December 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 37%.

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 spring is increasing, starting the season at 27% and ending it at 32%.

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 5.

Over the course of the spring in Grytviken, the chance of a day with only rain increases from 9% to 29%, the chance of a day with mixed snow and rain decreases from 9% to 2%, and the chance of a day with only snow decreases from 9% to 1%.

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 spring in Grytviken is increasing, starting the season at 0.8 inches, when it rarely exceeds 1.6 inches or falls below 0.2 inches, and ending the season at 1.7 inches, when it rarely exceeds 2.6 inches or falls below 1.0 inches.

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 spring in Grytviken is very rapidly decreasing, starting the season at 6.2 inches, when it rarely exceeds 10.2 inches or falls below 1.9 inches, and ending the season at 1.0 inches, when it rarely exceeds 2.7 inches or falls below -0.0 inches.

The highest average 31-day accumulation is 6.3 inches on September 10.

Over the course of the spring 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 6 hours, 4 minutes, implying an average daily increase of 4 minutes, 2 seconds, and weekly increase of 28 minutes, 17 seconds.

The shortest day of the spring is September 1, with 10 hours, 41 minutes of daylight and the longest day is November 30, with 16 hours, 45 minutes of daylight.

The latest sunrise of the spring in Grytviken is 7:05 AM on September 1 and the earliest sunrise is 3 hours, 13 minutes earlier at 3:52 AM on November 30.

The earliest sunset is 5:46 PM on September 1 and the latest sunset is 2 hours, 51 minutes later at 8:37 PM on November 30.

Daylight saving time is not observed in Grytviken during 2025.

For reference, on December 21, the longest day of the year, the Sun rises at 3:47 AM and sets 17 hours, 13 minutes later, at 9:00 PM, while on June 21, the shortest day of the year, it rises at 8:48 AM and sets 7 hours, 19 minutes later, at 4:07 PM.

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.

The figure below presents a compact representation of key lunar data for the spring of 2025. 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.

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 spring, remaining around 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 in Grytviken is rapidly decreasing during the spring, decreasing from 20.0 miles per hour to 17.5 miles per hour over the course of the season.

For reference, on August 29, the windiest day of the year, the daily average wind speed is 20.3 miles per hour, while on December 22, the calmest day of the year, the daily average wind speed is 17.0 miles per hour.

The hourly average wind direction in Grytviken throughout the spring is predominantly from the west, with a peak proportion of 60% on October 9.

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 increasing during the spring, rising by 2°F, from 32°F to 35°F, over the course of the season.

The lowest average surface water temperature during the spring is 32°F on September 8.

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 31 to around March 18, rarely starting before December 3, or ending after April 21.

The spring in Grytviken is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually increasing from -0% to 7% over the course of the 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 spring, remaining around 0°F throughout.

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 very rapidly increasing during the spring, rising by 3.5 kWh, from 1.5 kWh to 5.0 kWh, over the course of the season.

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%).