April Weather in Grytviken South Georgia & South Sandwich Islands

Daily high temperatures decrease by 2°F, from 38°F to 35°F, rarely falling below 32°F or exceeding 41°F.

Daily low temperatures decrease by 3°F, from 34°F to 32°F, rarely falling below 28°F or exceeding 37°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 23, 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 temperatures for the quarter of the year centered on April. 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 month of April in Grytviken experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 71% throughout the month.

The clearest day of the month is April 15, with clear, mostly clear, or partly cloudy conditions 30% 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%.

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 April is essentially constant, remaining around 39% throughout.

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 April in Grytviken, the chance of a day with only rain decreases from 37% to 32%, the chance of a day with mixed snow and rain increases from 1% to 4%, and the chance of a day with only snow remains an essentially constant 1% throughout.

Rainfall

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 April in Grytviken is gradually decreasing, starting the month at 2.4 inches, when it rarely exceeds 3.4 inches or falls below 1.4 inches, and ending the month at 2.0 inches, when it rarely exceeds 2.9 inches or falls below 1.1 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 April in Grytviken is gradually increasing, starting the month at 0.4 inches, when it rarely exceeds 1.5 inches or falls below -0.0 inches, and ending the month at 1.3 inches, when it rarely exceeds 3.4 inches or falls below -0.0 inches.

Over the course of April in Grytviken, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 0 minutes, implying an average daily decrease of 4 minutes, 8 seconds, and weekly decrease of 28 minutes, 54 seconds.

The shortest day of the month is April 30, with 9 hours, 17 minutes of daylight and the longest day is April 1, with 11 hours, 17 minutes of daylight.

The earliest sunrise of the month in Grytviken is 6:50 AM on April 1 and the latest sunrise is 53 minutes later at 7:44 AM on April 30.

The latest sunset is 6:07 PM on April 1 and the earliest sunset is 1 hour, 6 minutes earlier at 5:01 PM on April 30.

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.

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 April 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.

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 April, 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 essentially constant during April, remaining within 0.3 miles per hour of 18.7 miles per hour throughout.

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 April is 19.0 miles per hour on April 29.

The hourly average wind direction in Grytviken throughout April is predominantly from the west, with a peak proportion of 55% on April 14.

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 essentially constant during April, remaining within 1°F of 37°F throughout.

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 month of April in Grytviken is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 30% to 2% over the course of the month.

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 April, 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 gradually decreasing during April, falling by 0.9 kWh, from 1.8 kWh to 0.9 kWh, over the course of the month.

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%).