There is no such thing as bad weather, just the wrong clothing. Regardless of whether you are travelling to Greenland during the winter, the spring or the summer, we recommend that you dress according to the layer-to-layer principle. The outermost layer should be wind and waterproof, and underneath you should wear items such as synthetic fibre fur and/or wool. Even in the middle of summer, when it can be warm on land, sailing trips can be cold as the temperature of the water is only one or two degrees Celsius (33-36 degrees Fahrenheit). So bring a hat, scarf and gloves with you on a sailing trip. During the summer it can occasionally be so warm that shorts and t-shirts are suitable, although mosquitoes can be a problem in July and August. It is important to bring a mosquito net, insect repellent and antihistamine if you are allergic to insect bites.
Regardless of the nature of your visit to Greenland, you will often have to travel a lot on foot, and frequently in hilly and uneven terrain. Therefore it is important to bring good, waterproof walking boots or walking shoes with a sturdy moulded sole. If it is the first time you are using this type of footwear, make sure you break the boots in before departure so as to avoid blisters.
If you are coming to Greenland in spring to drive a dogsled, you can hire leather clothing and boots at the local tourist office or from the sled tour company. This is highly recommended as even light winds at sub-zero temperatures can feel bitterly cold.