Home › Cities › South Georgia › Grytviken

Grytviken, South Georgia climate

ET Tundra

Grytviken has a remarkably steady subarctic climate (Tundra, Köppen ET). The hottest month is February with an average daily high near 4°C, while the coldest is July averaging around −4°C at night. Precipitation is fairly even year-round, totalling about 1702 mm. Snowfall is heavy (685 cm of snow per year on average). At latitude 54°S, day length swings from 7.1 hours in midwinter to 16.9 hours at midsummer.

☀️ Summers

Cold

Highs near 4°C in February.

❄️ Winters

Cold

Lows near −4°C in July.

About 226 freezing nights a year

🌧️ Rain & snow

Very wet

About 1702 mm of rain a year, plus 685 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Grytviken climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	4	4	3	2	1	0	−1	−1	−1	0	1	2
Avg temp (°C)	2	3	2	1	−1	−2	−2	−2	−2	−1	0	1
Avg low (°C)	1	2	1	0	−2	−3	−4	−4	−3	−2	−1	0
Precipitation (mm)	141	137	160	154	147	139	144	149	136	135	129	131
Snowfall (cm)	32	20	33	45	66	83	83	82	77	66	53	45

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	4	4	3	2	1	0
Avg temp (°C)	2	3	2	1	−1	−2
Avg low (°C)	1	2	1	0	−2	−3
Precipitation (mm)	141	137	160	154	147	139
Snowfall (cm)	32	20	33	45	66	83

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−1	−1	−1	0	1	2
Avg temp (°C)	−2	−2	−2	−1	0	1
Avg low (°C)	−4	−4	−3	−2	−1	0
Precipitation (mm)	144	149	136	135	129	131
Snowfall (cm)	83	82	77	66	53	45

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with low ≤ 0°C (days)	4	3	6	13	23	27	29	30	29	28	21	12

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with low ≤ 0°C (days)	4	3	6	13	23	27

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with low ≤ 0°C (days)	29	30	29	28	21	12

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	89	89	89	89	88	85	86	84	85	85	85	89
Relative humidity (%)	90	90	89	89	88	89	89	89	89	90	90	89
Wind speed (m/s)	6.6	6.9	7.1	7.2	7.1	6.9	7.4	7.6	7.2	7.1	6.9	6.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	89	89	89	89	88	85
Relative humidity (%)	90	90	89	89	88	89
Wind speed (m/s)	6.6	6.9	7.1	7.2	7.1	6.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	86	84	85	85	85	89
Relative humidity (%)	89	89	89	90	90	89
Wind speed (m/s)	7.4	7.6	7.2	7.1	6.9	6.5

Methodology & sources

Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →