Climate Insights for Rjukan

The climate in Rjukan is cool. The average annual temperature is 3°C and approximately 1281mm of precipitation falls per year. Rjukan receives a notable amount of rainfall throughout the year, including during its driest month. Rjukan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, February, December, when temperatures can drop to -9°C. Rjukan experiences heavy snowfall, typically from January through December.

Temperatures in Rjukan vary considerably across the year, with a 25°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 16°C with a mean of 12°C. The coldest month is January, when overnight lows fall to -9°C and the daily average is -6°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 6°C shift in average temperatures.

Rjukan is a fairly wet location, receiving approximately 1281mm of precipitation annually, which averages out to around 107mm per month. The wettest month is September, averaging 164mm of rainfall. August and July also tend to see above-average precipitation. The driest month is April, with just 57mm. That's 107mm 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. Rjukan receives heavy snowfall, accumulating around 361cm annually from January through December. The snowiest month is December, with approximately 67cm. Winter travel should account for significant snow cover.

Rjukan is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently spring in Rjukan, which began on March 20, 2026. Rjukan 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 16°C, while the coldest stretch bottoms out in January near -9°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Rjukan 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.