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May Weather in Grytviken South Georgia & South Sandwich Islands

Daily high temperatures decrease by 2°F, from 35°F to 33°F, rarely falling below 29°F or exceeding 38°F.

Daily low temperatures decrease by 3°F, from 32°F to 29°F, rarely falling below 24°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 23, the coldest day of the year, they range from 26°F to 31°F.

Average High and Low Temperature in May in Grytviken

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 temperatures for the quarter of the year centered on May. 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 May in Grytviken

Average Hourly Temperature in May in GrytvikenMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJunfreezingvery 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 month of May in Grytviken experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 72% to 77%.

The clearest day of the month is May 2, with clear, mostly clear, or partly cloudy conditions 28% 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 May in Grytviken

Cloud Cover Categories in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 128%May 128%May 3123%May 3123%May 1127%May 1127%May 2125%May 2125%mostly clearpartly cloudymostly cloudyovercastclear
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 May is rapidly decreasing, starting the month at 37% and ending it at 31%.

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 May in Grytviken, the chance of a day with only rain decreases from 32% to 19%, the chance of a day with mixed snow and rain increases from 4% to 7%, and the chance of a day with only snow increases from 1% to 5%.

Probability of Precipitation in May in Grytviken

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 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 May in Grytviken is decreasing, starting the month at 2.0 inches, when it rarely exceeds 2.9 inches or falls below 1.1 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.5 inches or falls below 0.6 inches.

Average Monthly Rainfall in May in Grytviken

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 May in Grytviken is increasing, starting the month at 1.4 inches, when it rarely exceeds 3.5 inches or falls below -0.0 inches, and ending the month at 3.7 inches, when it rarely exceeds 7.7 inches or falls below 0.3 inches.

Average Monthly Snowfall in May in Grytviken

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 May 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 1 hour, 33 minutes, implying an average daily decrease of 3 minutes, 5 seconds, and weekly decrease of 21 minutes, 36 seconds.

The shortest day of the month is May 31, with 7 hours, 41 minutes of daylight and the longest day is May 1, with 9 hours, 13 minutes of daylight.

Hours of Daylight and Twilight in May in Grytviken

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 earliest sunrise of the month in Grytviken is 7:46 AM on May 1 and the latest sunrise is 47 minutes later at 8:33 AM on May 31.

The latest sunset is 4:59 PM on May 1 and the earliest sunset is 45 minutes earlier at 4:14 PM on May 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 May in Grytviken

The solar day over the course of May. 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 May in Grytviken

Solar Elevation and Azimuth in May in GrytvikenMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJun00101020000101020
northeastsouthwest
Solar elevation and azimuth over the course of May 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 May 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 May in Grytviken

Moon Rise, Set & Phases in May in GrytvikenMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 84:22 PMApr 84:22 PMApr 239:50 PMApr 239:50 PMMay 81:23 AMMay 81:23 AMMay 2311:54 AMMay 2311:54 AMJun 610:38 AMJun 610:38 AMJun 2111:09 PMJun 2111:09 PM6:35 AM6:35 AM5:43 PM5:43 PM4:55 PM4:55 PM8:19 AM8:19 AM8:48 AM8:48 AM4:29 PM4:29 PM3:26 PM3:26 PM8:46 AM8:46 AM9:21 AM9:21 AM3:27 PM3:27 PM2:55 PM2:55 PM10:07 AM10:07 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.
May 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%-3:07 PMSW11:23 PMSE6:39 AMN232,436 mi
2
40%-3:21 PMWSW-7:31 AMN230,083 mi
3
28%12:57 AMESE3:32 PMWSW-8:21 AMN228,048 mi
4
18%2:29 AME3:41 PMW-9:10 AMN226,531 mi
5
10%4:02 AME3:50 PMW-9:59 AMN225,737 mi
6
4%5:35 AMENE4:00 PMWNW-10:49 AMN225,828 mi
7
0%7:11 AMENE4:12 PMWNW-11:42 AMN226,890 mi
8
0%8:48 AMNE4:29 PMNW-12:39 PMN228,899 mi
9
3%10:23 AMNE4:56 PMNW-1:39 PMN231,713 mi
10
8%11:46 AMNE5:36 PMNW-2:41 PMN235,089 mi
11
16%12:50 PMNE6:35 PMNW-3:43 PMN238,720 mi
12
24%1:33 PMNE7:50 PMNW-4:41 PMN242,285 mi
13
34%1:59 PMNE9:10 PMNW-5:35 PMN245,497 mi
14
44%2:16 PMNE10:31 PMNW-6:23 PMN248,132 mi
15
50%2:28 PMENE11:49 PMWNW-7:08 PMN250,039 mi
16
63%2:36 PMENE--7:49 PMN251,138 mi
17
72%-1:04 AMWNW2:43 PME8:28 PMN251,423 mi
18
81%-2:17 AMW2:50 PME9:06 PMN250,946 mi
19
88%-3:30 AMW2:56 PME9:45 PMN249,808 mi
20
94%-4:44 AMWSW3:04 PMESE10:26 PMN248,144 mi
21
98%-6:01 AMWSW3:13 PMESE11:10 PMN246,107 mi
22
100%-7:22 AMSW3:26 PMSE11:57 PMN243,854 mi
23
100%-8:46 AMSW3:45 PMSE--
24
100%-10:08 AMSW4:16 PMSE12:48 AMN241,529 mi
25
97%-11:20 AMSW5:04 PMSE1:44 AMN239,251 mi
26
92%-12:14 PMSW6:12 PMSE2:41 AMN237,106 mi
27
85%-12:50 PMSW7:37 PMSE3:39 AMN235,145 mi
28
77%-1:13 PMSW9:09 PMSE4:35 AMN233,391 mi
29
66%-1:29 PMWSW10:41 PMESE5:28 AMN231,858 mi
30
50%-1:40 PMWSW-6:18 AMN230,567 mi
31
43%12:12 AMESE1:49 PMW-7:06 AMN229,564 mi

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 May, remaining around 0% throughout.

Humidity Comfort Levels in May in Grytviken

Humidity Comfort Levels in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 160%May 160%May 10%May 10%May 310%May 310%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 essentially constant during May, remaining within 0.3 miles per hour of 18.6 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 lowest daily average wind speed during May is 18.3 miles per hour on May 26.

Average Wind Speed in May in Grytviken

Average Wind Speed in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphAprJunMay 2618.3 mphMay 2618.3 mphMay 118.9 mphMay 118.9 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 May is predominantly from the west, with a peak proportion of 52% on May 1.

Wind Direction in May in Grytviken

Wind Direction in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunwestsouthnortheast
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 essentially constant during May, remaining within 1°F of 35°F throughout.

Average Water Temperature in May in Grytviken

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 month of May in Grytviken is reliably fully outside of the growing season.

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

Time Spent in Various Temperature Bands and the Growing Season in May in Grytvikengrowing seasonMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 12%May 12%May 31-0%May 31-0%May 110%May 110%May 21-0%May 21-0%Apr 2010%Apr 2010%freezingvery 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 May, remaining around 0°F throughout.

Growing Degree Days in May in Grytviken

Growing Degree Days in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0°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°FAprJunMay 10°FMay 10°FMay 310°FMay 310°FMay 110°FMay 110°FMay 210°FMay 210°F
The average growing degree days accumulated over the course of May, 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 essentially constant during May, remaining within 0.2 kWh of 0.7 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May in Grytviken

Average Daily Incident Shortwave Solar Energy in May in GrytvikenMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 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 kWhAprJunMay 10.9 kWhMay 10.9 kWhMay 310.4 kWhMay 310.4 kWhMay 110.7 kWhMay 110.7 kWhMay 210.5 kWhMay 210.5 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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