Climate Insights for Longyearbyen

The climate in Longyearbyen is cold. The average annual temperature is -4°C and approximately 615mm of precipitation falls per year. September is the wettest month, receiving around 80mm of rainfall. Longyearbyen is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are March, January, February, when temperatures can drop to -15°C. Longyearbyen experiences heavy snowfall, typically from January through December.

Temperatures in Longyearbyen vary considerably across the year, with a 23°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 8°C with a mean of 6°C. The coldest month is March, when overnight lows fall to -15°C and the daily average is -13°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between April and May, with a 6°C shift in average temperatures.

Longyearbyen is a relatively dry area, receiving approximately 615mm of precipitation annually, which averages out to around 51mm per month. The wettest month is September, averaging 80mm of rainfall. August and November also tend to see above-average precipitation. The driest month is June, with just 29mm. That's 50mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Longyearbyen receives heavy snowfall, accumulating around 346cm annually from January through December. The snowiest month is December, with approximately 57cm. Winter travel should account for significant snow cover.

Longyearbyen is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in Longyearbyen, which began on June 21, 2026. Longyearbyen is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 8°C, while the coldest stretch bottoms out in March near -15°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The table below shows monthly climate averages for Longyearbyen based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.