Other facts from our historical weather data: Which months have the greatest rainfall in Grytviken? Most rainfall (rainy season) is seen in March and April. Which is the warmest month in Grytviken? February has an average maximum temperature of 5°C (41°F) and is the warmest month of the year. Which is the coldest month in Grytviken? The coldest month is July with an average maximum temperature of -1°C (30°F). Which is the wettest month in Grytviken? March tops the wettest month list with 155mm (6.1 in) of rainfall. Which is the driest month in Grytviken? November is the driest month with 122mm (4.8 in) of precipitation. Which is the sunniest month in Grytviken? November is the sunniest month with an average of 175 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.