March in Longyearbyen is the most freezing month of the year. In March, the weather in Longyearbyen is typically freezing. Average daily high temperature in March is about 11 degrees below zero. On average, Longyearbyen has 10 cloudy, 9 snowy, 7 partly cloudy, and 5 sunny days in March. The snowfalls are usually light. March as well as January, February, June, and July is considered the most uncomfortable time to visit Longyearbyen.