Greenland's south coast is the only part of the island which is free from ice during the summer: therefore go there between June and August for the high season. And if the ice doesn't bother you, you can go there between May and September: it's actually the hottest part of the country. Temperatures can rise to around 10 degrees in summer, and at that time the climate is almost pleasant.
Favour the months of June to August to go to the East of Greenland: this way, you'll perhaps benefit from temperatures above zero! The climate of this region is very dry and is characterised by quite a violent wind. Cover yourself up, and choose the summer to discover this region, unless you want to ski in which case go in spring.
Choose spring to benefit from the best climatic conditions to practice skiing, helicopter skiing on glaciers, as well as trips in dog sleds. You can also attend the Arctic Circle Race, the toughest skiing race in the world, the golf World Championships, or even the Snow Sculpture Festival in Nuuk.
Exploring Greenland by boat is an unforgettable experience. You will navigate between icebergs of all sizes, and you will also spend time on the deck: it's actually your only chance to spot humpback whales close up. You should also come across seal colonies in your path. Let yourself be impressed by nature's show. Go preferably between June and August.
It's best to go in summer to discover the West of Greenland. Temperatures there are actually very low, and can fall to -30 degrees in winter! The climate there is cold and dry, and the wind blows throughout the whole year. Choose summer then to make your trip more pleasant, or spring for snow sports.