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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 39°F, while the coldest is July averaging around 25°F at night. Precipitation is fairly even year-round, totalling about 67 inches. Snowfall is heavy (270 inches 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.
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 figuresHours 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 (°F) | 38 | 39 | 38 | 36 | 33 | 31 | 30 | 30 | 31 | 32 | 34 | 36 |
| Avg temp (°F) | 36 | 37 | 36 | 34 | 31 | 29 | 28 | 28 | 28 | 30 | 32 | 34 |
| Avg low (°F) | 34 | 35 | 34 | 32 | 29 | 27 | 25 | 25 | 26 | 28 | 31 | 33 |
| Precipitation (in) | 5.5 | 5.4 | 6.3 | 6.1 | 5.8 | 5.5 | 5.7 | 5.9 | 5.4 | 5.3 | 5.1 | 5.1 |
| Snowfall (in) | 12.6 | 8.0 | 13.2 | 17.6 | 25.9 | 32.7 | 32.6 | 32.5 | 30.4 | 26.1 | 20.8 | 17.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 38 | 39 | 38 | 36 | 33 | 31 |
| Avg temp (°F) | 36 | 37 | 36 | 34 | 31 | 29 |
| Avg low (°F) | 34 | 35 | 34 | 32 | 29 | 27 |
| Precipitation (in) | 5.5 | 5.4 | 6.3 | 6.1 | 5.8 | 5.5 |
| Snowfall (in) | 12.6 | 8.0 | 13.2 | 17.6 | 25.9 | 32.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 30 | 30 | 31 | 32 | 34 | 36 |
| Avg temp (°F) | 28 | 28 | 28 | 30 | 32 | 34 |
| Avg low (°F) | 25 | 25 | 26 | 28 | 31 | 33 |
| Precipitation (in) | 5.7 | 5.9 | 5.4 | 5.3 | 5.1 | 5.1 |
| Snowfall (in) | 32.6 | 32.5 | 30.4 | 26.1 | 20.8 | 17.6 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with low ≤ 32°F (days) | 4 | 3 | 6 | 13 | 23 | 27 | 29 | 30 | 29 | 28 | 21 | 12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with low ≤ 32°F (days) | 4 | 3 | 6 | 13 | 23 | 27 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with low ≤ 32°F (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 (mph) | 14.7 | 15.5 | 15.9 | 16.0 | 15.8 | 15.5 | 16.5 | 16.9 | 16.1 | 15.8 | 15.4 | 14.6 |
| 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 (mph) | 14.7 | 15.5 | 15.9 | 16.0 | 15.8 | 15.5 |
| 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 (mph) | 16.5 | 16.9 | 16.1 | 15.8 | 15.4 | 14.6 |
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.