Climate - Trondheim (Norway)

The climate of Trondheim is moderately continental, with cold winters, during which the average temperature is a few degrees below freezing, and mild summers.
The city is located is located in the county of Trøndelag, which occupies the central part of Norway. We are inside a large and deep fjord that flows into the west coast, and therefore there is a slightly colder and less rainy winter than the coast directly exposed to the Atlantic Ocean (in the part called Norwegian Sea). The result is a contrasted climate, which is affected by both the maritime influence from the west and the continental influence from the east.

The winter is cold and cloudy.
There are quite mild periods, more or less long depending on the winter, in which Atlantic currents prevail, the temperature exceeds freezing, it often rains and the wind blows.
There are also colder periods, when it can snow, and the temperature can drop below freezing. Snowfall can sometimes be abundant.
On the coldest nights of the year, the temperature can drop as low as -20 °C (-4 °F), but sometimes even as low as -25 °C (-13 °F).

The summer is mild, with fairly frequent rains. The days are very long.
There are periods characterized by rain and cool weather, with highs below 15 °C (59 °F). However, there are also periods when it does not rain and the temperature exceeds 20 °C (68 °F).
Occasionally, there may also be short hot periods, in which the temperature reaches 30 °C (86 °F). In July 2019, the temperature reached 33.5 °C (92.3 °F) at the airport, and exceeded 30 °C (86 °F) for six consecutive days. In June 2020, the heat record was broken, with 34.3 °C (93.7 °F).



The latitude of Trondheim is 63°26'N. On the shortest day of the year, December 21st, the sun rises at 10:00 am and sets at 2:30 pm. On the longest day, June 21, the sun rises at 3:00 am and sets at 23:40 pm. The white nights, in which it is not completely dark even at midnight, occur from April 30 to August 13.

Best Time

The best time to visit Trondheim is the summer, from June to August, since it is the mildest season. However, you must take into account some rainy days and a bit of cold at night.

Trondheim - Climate data

In Trondheim, the average temperature of the coldest month (January) is of -1.1 °C (30.0 °F), that of the warmest month (July) is of 15.6 °C (60.1 °F). Here are the average temperatures.
In Trondheim, precipitation amounts to 845 millimeters (33.3 inches) per year: so, it is at an intermediate level. It ranges from 40 mm (1.6 in) in the driest month (April) to 90 mm (3.5 in) in the wettest one (September). Here is the average precipitation.
At Trondheim, the sea temperature ranges from 6 °C (43 °F) in March to 13.5 °C (56 °F) in August. Here are the average sea temperatures.
In Trondheim, there are on average around 1250 sunshine hours per year. Here are the average hours of sunshine per day.

Trondheim - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Trondheim is usually very cold. The average temperature is of -1.1 °C (30 °F), with a minimum of -4.1 °C (24.6 °F) and a maximum of 1.9 °C (35.5 °F).
On the coldest nights of the month, the temperature usually drops to around -15.5 °C (4 °F). However, it dropped to -25.6 °C (-14.1 °F) in January 1996.
On the warmest days of the month, the temperature usually reaches around 8.5 °C (47.5 °F). However, it reached 13.1 °C (55.6 °F) in January 2020.
Precipitation amounts to 65 mm (2.6 in), distributed over 12 days.
The day lasts on average 5 hours and 55 minutes. So the days are short.
There are on average 0.5 hours of sunshine per day. So, the sun shines 7% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 15 kph (10 mph).
The average sea temperature is of 6.5 °C (44 °F). Therefore, the sea is very cold for swimming.

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In February, the weather in Trondheim is usually very cold. The average temperature is of -1.0 °C (30 °F), with a minimum of -4.1 °C (24.6 °F) and a maximum of 2 °C (35.6 °F).
On the coldest nights of the month, the temperature usually drops to around -15 °C (5 °F). However, it dropped to -25.1 °C (-13.2 °F) in February 2010.
On the warmest days of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 12.5 °C (54.5 °F) in February 1998.
Precipitation amounts to 65 mm (2.6 in), distributed over 12 days.
The day lasts on average 8 hours and 50 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 22% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 6.5 °C (43.5 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Trondheim is usually cold. The average temperature is of 1.2 °C (34 °F), with a minimum of -2.2 °C (28 °F) and a maximum of 4.6 °C (40.3 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -12 °C (10 °F). However, it dropped to -20.5 °C (-4.9 °F) in March 2018.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 10.5 °C (51 °F). However, it reached 14.4 °C (57.9 °F) in March 2019.
Precipitation amounts to 65 mm (2.6 in), distributed over 13 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 6 °C (43 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Trondheim is usually quite cold. The average temperature is of 5.3 °C (42 °F), with a minimum of 1.4 °C (34.5 °F) and a maximum of 9.3 °C (48.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -5 °C (23.5 °F). However, it dropped to -10.4 °C (13.3 °F) in April 1996.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 16.5 °C (61.5 °F). However, it reached 23.3 °C (73.9 °F) in April 2019.
Precipitation amounts to 40 mm (1.6 in), distributed over 10 days.
The day lasts on average 15 hours and 5 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 67%.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 6.5 °C (43.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Trondheim is usually mild. The average temperature is of 9.5 °C (49 °F), with a minimum of 5.3 °C (41.5 °F) and a maximum of 13.8 °C (56.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (31.5 °F). However, it dropped to -3 °C (26.6 °F) in May 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 22.5 °C (72.5 °F). However, it reached 27.8 °C (82 °F) in May 2018.
Precipitation amounts to 55 mm (2.2 in), distributed over 11 days.
The day lasts on average 18 hours and 20 minutes. So the days are very long.
There are on average 6.5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 68%.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 8 °C (46 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Trondheim is usually mild. The average temperature is of 13.0 °C (55 °F), with a minimum of 8.9 °C (48 °F) and a maximum of 17.1 °C (62.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 3 °C (38 °F). However, it dropped to 0.1 °C (32.2 °F) in June 1997.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 25 °C (77 °F). However, it reached 34.3 °C (93.7 °F) in June 2020.
Precipitation amounts to 80 mm (3.1 in), distributed over 13 days.
The day lasts on average 20 hours and 25 minutes. So the days are very long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 5.5 hours of sunshine per day. So, the sun shines 27% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 10.5 °C (50.5 °F). Therefore, the sea is very cold for swimming.

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In July, the warmest month of the year, the weather in Trondheim is usually very mild. The average temperature is of 15.6 °C (60 °F), with a minimum of 11.4 °C (52.5 °F) and a maximum of 19.8 °C (67.7 °F).
On the coldest nights of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 3.7 °C (38.7 °F) in July 1995.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 33.5 °C (92.3 °F) in July 2019.
Precipitation amounts to 75 mm (3 in), distributed over 11 days.
The day lasts on average 19 hours and 10 minutes. So the days are very long.
There are on average 6 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 13 °C (55 °F). Therefore, the sea is very cold for swimming.

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In August, the weather in Trondheim is usually very mild. The average temperature is of 15.0 °C (59 °F), with a minimum of 11 °C (51.7 °F) and a maximum of 19.1 °C (66.4 °F).
On the coldest nights of the month, the temperature usually drops to around 5 °C (41.5 °F). However, it dropped to 2.6 °C (36.7 °F) in August 1995.
On the warmest days of the month, the temperature usually reaches around 26.5 °C (80 °F). However, it reached 31.3 °C (88.3 °F) in August 1994.
Precipitation amounts to 85 mm (3.3 in), distributed over 13 days.
The day lasts on average 16 hours and 5 minutes. So the days are long.
There are on average 4.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

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In September, the weather in Trondheim is usually mild. The average temperature is of 11.4 °C (53 °F), with a minimum of 7.8 °C (46 °F) and a maximum of 15 °C (59.1 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 1.5 °C (34.5 °F). However, it dropped to -2.3 °C (27.9 °F) in September 2013.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 22.5 °C (72 °F). However, it reached 27.9 °C (82.2 °F) in September 1999.
Precipitation amounts to 90 mm (3.5 in), distributed over 13 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 33% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 12.5 °C (54.5 °F). Therefore, the sea is very cold for swimming.

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In October, the weather in Trondheim is usually quite cold. The average temperature is of 6.1 °C (43 °F), with a minimum of 2.9 °C (37.2 °F) and a maximum of 9.3 °C (48.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -4.5 °C (23.5 °F). However, it dropped to -10.8 °C (12.6 °F) in October 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 16 °C (61 °F). However, it reached 22.1 °C (71.8 °F) in October 2018.
Precipitation amounts to 80 mm (3.1 in), distributed over 13 days.
The day lasts on average 9 hours and 50 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 26% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 10.5 °C (50.5 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Trondheim is usually cold. The average temperature is of 1.8 °C (35 °F), with a minimum of -1.1 °C (30 °F) and a maximum of 4.7 °C (40.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -10 °C (14 °F). However, it dropped to -18.5 °C (-1.3 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 11.5 °C (52.5 °F). However, it reached 16.1 °C (61 °F) in November 2005.
Precipitation amounts to 65 mm (2.6 in), distributed over 11 days.
The day lasts on average 6 hours and 40 minutes. So the days are short.
There is an average of 1 hour of sunshine per day. So, the sun shines 18% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 14 kph (8 mph).
The average sea temperature is of 8.5 °C (47.5 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Trondheim is usually very cold. The average temperature is of -0.8 °C (31 °F), with a minimum of -3.8 °C (25.1 °F) and a maximum of 2.4 °C (36.2 °F).
On the coldest nights of the month, the temperature usually drops to around -14 °C (7 °F). However, it dropped to -22.4 °C (-8.3 °F) in December 1993.
On the warmest days of the month, the temperature usually reaches around 9.5 °C (48.5 °F). However, it reached 13.1 °C (55.6 °F) in December 2000.
Precipitation amounts to 80 mm (3.1 in), distributed over 14 days.
The day lasts on average 4 hours and 40 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 0 hours of sunshine per day. So, the sun shines 4% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 7.5 °C (45 °F). Therefore, the sea is very cold for swimming.