The Northwest Territories' climate is cold but relatively dry, with warm, sunny summers, in which temperatures can reach 35°C (95°F), and long, bitter winters, during which the thermometer can plunge to -45°C (-49°F).

Winter weather requires down-filled and other polar-temperature gear. Special clothing is required for adventure expeditions. Good-quality windproof and waterproof clothes, warm jerseys, gloves and moulded-sole shoes are needed at all times of the year. In the summer, thinner clothes suffice, although the temperature can drop quickly so layers should be worn. A mosquito net and repellent are essential in some areas during July and August.