In South Georgia, an island of the southern Atlantic Ocean administered by the United Kingdom, the climate is maritime subpolar, so that the average temperature of the warmest month, February, is just 6 °C (43 °F) in the main city, Grytviken.
Winter is cold, and the daily average of the coldest months is around freezing (0 °C or 32 °F).
Here are the average temperatures of Grytviken.
Average temperatures - Grytviken

Grytviken	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Grytviken	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	3	4	3	1	-1	-2	-2	-2	-1	0	1	2
Max (°C)	8	9	8	6	4	2	2	3	4	5	6	7
Min (°F)	37	39	37	34	30	28	28	28	30	32	34	36
Max (°F)	46	48	46	43	39	36	36	37	39	41	43	45

The island is exposed to the intense and incessant flow of the westerly winds, which bring disturbances, able to cause rain or snow throughout the year. The annual precipitation amounts to 1,400 millimetres (55 inches) per year in Grytviken, and is well distributed throughout the year, although it drops slightly below 100 mm (4 in) per month from September to January, that is, between spring and early summer, while it hovers between 115 and 145 mm (4.5 and 5.7 in) per month between February and August, that is, from late summer to late winter.
Here is the average precipitation.
Average precipitation - Grytviken

Grytviken	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Grytviken	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	95	115	135	135	145	135	140	135	95	80	95	85	1395
Prec.(in)	3.7	4.5	5.3	5.3	5.7	5.3	5.5	5.3	3.7	3.1	3.7	3.3	54.9
Days	12	13	14	14	12	15	15	14	11	12	11	11	154

Given the temperatures, snowfall is more likely from mid-April to October, but sometimes it can occur also in summer, even at sea level. Gale force winds may blow throughout the year, and the humidity is consistently high.
The amount of sunshine is scarce, especially in winter, when the sun is almost never seen.
Sunshine - Grytviken

Grytviken	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Grytviken	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	5	6	4	2	1	0	1	2	4	6	6	5

At sea level, the temperature can drop a few degrees below freezing even in summer, while in winter it can drop to -10/-12 °C (10/14 °F) after outbreaks of Antarctic air masses, although the severe frost doesn't last long, because after a while the westerlies start to blow again. On the other hand, in South Georgia it practically never gets hot: the temperature can reach at most 20/22 °C (68/72 °F), from November to March.
In inland areas, where there are hills and mountains, the climate gets colder, and given the low summer temperatures, glaciers cover most of the island from an altitude of 300 metres (1,000 feet) above sea level, and some glacial tongues descend by gravity to the sea. The more you go up in altitude, the easier it is to see the snow falling even in summer. The highest peak is Mount Paget, 2,935 metres (9,629 feet) high.



The sea is very cold throughout the year, and in winter and spring it approaches the freezing point, although the sea, being salty, freezes at about -2 °C (28 °F).
Sea temperature - Grytviken

Grytviken	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Grytviken	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	3	3	3	3	2	1	1	0	0	0	1	2
Sea (°F)	37	37	37	37	36	34	34	32	32	32	34	36

The best time to visit South Georgia is the austral summer, from December to March, and especially from January to March, when temperatures are higher. It must be said that in this period the weather is not always clement: the temperature is low, it can rain, the wind often blows, and in inland hills and mountains (but sometimes even on the coast), it can snow. It will therefore be useful to bring warm clothes, hoping to have the chance to remove some of them on warmer days, when the temperature can approach 20 °C (68 °F).


In winter (June to August): warm clothes, fleece, down jacket, wind jacket, warm hat, gloves, scarf, raincoat, hiking boots.
In summer (December to March): warm clothes, sweater, raincoat, down jacket, hat, hiking boots; the outwer layer can be removed on warmer days. For inland hills and Mount Paget, warm clothes like in winter.