Climate Insights for Trondheim

The climate in Trondheim is cool. The average annual temperature is 6°C and approximately 1486mm of precipitation falls per year. Trondheim receives a notable amount of rainfall throughout the year, including during its driest month. Trondheim 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 January, February, March, when temperatures can drop to -3°C. Trondheim experiences heavy snowfall, typically from January through December.

Temperatures in Trondheim vary considerably across the year, with a 21°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 18°C with a mean of 14°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Trondheim is a fairly wet location, receiving approximately 1486mm of precipitation annually, which averages out to around 124mm per month. The wettest month is December, averaging 176mm of rainfall. September and January also tend to see above-average precipitation. The driest month is May, with just 89mm. That's 87mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Trondheim receives heavy snowfall, accumulating around 315cm annually from January through December. The snowiest month is January, with approximately 72cm. Winter travel should account for significant snow cover.

Trondheim 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 January, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, 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 Trondheim, which began on June 21, 2026. Trondheim 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 18°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The table below shows monthly climate averages for Trondheim 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.