Climate - Rønne (Denmark)

The climate of Rønne is Baltic, that is to say, relatively continental, with cold winters and mild to pleasantly warm summers.
The city is located on the island of Bornholm, which lies to the east of the main islands of Denmark, and to the south-east of Sweden, and has a relatively dry and sunny microclimate.
Given the latitude (55°06'N), the white nights, in which the sun sets but it does not get completely dark even at midnight, occur from June 9 to July 3.
Although the winter is not very cold for the latitude, it is often humid, windy and rainy. Snow is quite frequent, although generally not abundant. Even in spring, until April or the first half of May, there is often cold and unstable weather.
Occasionally, there may be cold waves, in which the temperature can drop below -10 °C (14 °F). The coldest record is -18.4 °C (-1.1 °F) and was set in February 1965.
In summer, short hot periods are possible. The highest record is 32 °C (89.6 °F).
In summer, also due to the length of the days, the sunshine amount is quite good.

Best Time

The best time to visit Rønne 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.

Rønne - Climate data

In Rønne, the average temperature of the coldest month (February) is of 1.3 °C (34.4 °F), that of the warmest month (August) is of 17.9 °C (64.2 °F). Here are the average temperatures.
In Rønne, precipitation amounts to 485 millimeters (19.1 inches) per year: it is therefore quite scarce. It ranges from 25 mm (1 in) in the driest month (February) to 55 mm (2.2 in) in the wettest one (September). Here is the average precipitation.
At Rønne, the sea temperature ranges from 3 °C (37 °F) in February, March to 18 °C (64 °F) in August. Here are the average sea temperatures.
In Rønne, there are on average around 2065 sunshine hours per year. Here are the average hours of sunshine per day.

Rønne - Weather by month

Based on the period 1991-2020

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In January, the weather in Rønne is usually cold. The average temperature is of 1.7 °C (35 °F), with a minimum of -0.4 °C (31.3 °F) and a maximum of 3.7 °C (38.7 °F).
On the coldest nights of the month, the temperature usually drops to around -8 °C (17.5 °F). However, it dropped to -15.1 °C (4.8 °F) in January 2003.
On the warmest days of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 10.3 °C (50.5 °F) in January 2007.
Precipitation amounts to 40 mm (1.6 in), distributed over 9 days.
The day lasts on average 7 hours and 55 minutes. So the days are short.
There are on average 1.5 hours of sunshine per day. So, the sun shines 18% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is 24 kph (15 mph).
The average sea temperature is of 3.5 °C (38.5 °F). Therefore, the sea is very cold for swimming.

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In February, the coldest month of the year, the weather in Rønne is usually cold. The average temperature is of 1.3 °C (34 °F), with a minimum of -0.8 °C (30.6 °F) and a maximum of 3.4 °C (38.2 °F).
On the coldest nights of the month, the temperature usually drops to around -7 °C (20 °F). However, it dropped to -14.1 °C (6.6 °F) in February 2003.
On the warmest days of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 10 °C (50 °F) in February 2020.
Precipitation amounts to 25 mm (1 in), distributed over 7 days.
The day lasts on average 9 hours and 40 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 28% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 23 kph (14 mph).
The average sea temperature is of 3 °C (37 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Rønne is usually cold. The average temperature is of 2.8 °C (37 °F), with a minimum of 0.1 °C (32.2 °F) and a maximum of 5.5 °C (41.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -6 °C (21 °F). However, it dropped to -15.7 °C (3.7 °F) in March 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 11 °C (52 °F). However, it reached 16.6 °C (61.9 °F) in March 1999.
Precipitation amounts to 30 mm (1.2 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 41% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 20 kph (13 mph).
The average sea temperature is of 3 °C (37.5 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Rønne is usually quite mild. The average temperature is of 6.7 °C (44 °F), with a minimum of 3 °C (37.4 °F) and a maximum of 10.3 °C (50.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -2.5 °C (27.5 °F). However, it dropped to -5 °C (23 °F) in April 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 18.5 °C (65.5 °F). However, it reached 26.6 °C (79.9 °F) in April 2000.
Precipitation amounts to 30 mm (1.2 in), distributed over 6 days.
The day lasts on average 14 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 5 °C (41.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Rønne is usually mild. The average temperature is of 10.9 °C (52 °F), with a minimum of 7 °C (44.7 °F) and a maximum of 14.8 °C (58.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 0.5 °C (33 °F). However, it dropped to -2.3 °C (27.9 °F) in May 2007.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23 °C (73.5 °F). However, it reached 28 °C (82.4 °F) in May 2018.
Precipitation amounts to 30 mm (1.2 in), distributed over 6 days.
The day lasts on average 16 hours and 10 minutes. So the days are long.
There are on average 10 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 9 °C (48.5 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Rønne is usually very mild. The average temperature is of 14.8 °C (59 °F), with a minimum of 11 °C (51.9 °F) and a maximum of 18.5 °C (65.3 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 3.3 °C (37.9 °F) in June 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 26 °C (79 °F). However, it reached 31.7 °C (89.1 °F) in June 1997.
Precipitation amounts to 45 mm (1.8 in), distributed over 7 days.
The day lasts on average 17 hours and 20 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 10.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 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 July, the weather in Rønne is usually very mild. The average temperature is of 17.5 °C (64 °F), with a minimum of 13.8 °C (56.8 °F) and a maximum of 21.3 °C (70.3 °F).
On the coldest nights of the month, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 5.7 °C (42.3 °F) in July 1996.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 32 °C (89.6 °F) in July 2015.
Precipitation amounts to 45 mm (1.8 in), distributed over 8 days.
The day lasts on average 16 hours and 40 minutes. So the days are long.
There are on average 9 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 17 °C (63 °F). Therefore, the sea is cold for swimming.

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In August, the warmest month of the year, the weather in Rønne is usually very mild. The average temperature is of 17.9 °C (64 °F), with a minimum of 14.4 °C (57.9 °F) and a maximum of 21.5 °C (70.6 °F).
On the coldest nights of the month, the temperature usually drops to around 9.5 °C (49 °F). However, it dropped to 6.4 °C (43.5 °F) in August 1999.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 32.1 °C (89.8 °F) in August 2002.
Precipitation amounts to 40 mm (1.6 in), distributed over 7 days.
The day lasts on average 14 hours and 50 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 18 °C (64 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Rønne is usually mild. The average temperature is of 14.4 °C (58 °F), with a minimum of 11.4 °C (52.4 °F) and a maximum of 17.5 °C (63.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 4.5 °C (40 °F). However, it dropped to 1 °C (33.8 °F) in September 1999.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 22 °C (72 °F). However, it reached 26.5 °C (79.7 °F) in September 2002.
Precipitation amounts to 55 mm (2.2 in), distributed over 9 days.
The day lasts on average 12 hours and 35 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 15.5 °C (60 °F). Therefore, the sea is cold for swimming.

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In October, the weather in Rønne is usually mild. The average temperature is of 10.0 °C (50 °F), with a minimum of 7.5 °C (45.4 °F) and a maximum of 12.5 °C (54.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0 °C (31.5 °F). However, it dropped to -5.7 °C (21.7 °F) in October 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 17 °C (62.5 °F). However, it reached 20.2 °C (68.4 °F) in October 1991.
Precipitation amounts to 50 mm (2 in), distributed over 10 days.
The day lasts on average 10 hours and 25 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 22 kph (13 mph).
The average sea temperature is of 12 °C (53.5 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Rønne is usually quite cold. The average temperature is of 6.2 °C (43 °F), with a minimum of 4.1 °C (39.4 °F) and a maximum of 8.2 °C (46.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -2.5 °C (27.5 °F). However, it dropped to -6.6 °C (20.1 °F) in November 2004.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 12 °C (54 °F). However, it reached 15 °C (59 °F) in November 2020.
Precipitation amounts to 50 mm (2 in), distributed over 11 days.
The day lasts on average 8 hours and 20 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 21% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is 23 kph (14 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 Rønne is usually cold. The average temperature is of 3.4 °C (38 °F), with a minimum of 1.4 °C (34.6 °F) and a maximum of 5.4 °C (41.7 °F).
On the coldest nights of the month, the temperature usually drops to around -5.5 °C (22 °F). However, it dropped to -14.1 °C (6.6 °F) in December 1995.
On the warmest days of the month, the temperature usually reaches around 9 °C (48.5 °F). However, it reached 11.3 °C (52.3 °F) in December 2015.
Precipitation amounts to 40 mm (1.6 in), distributed over 10 days.
The day lasts on average 7 hours and 20 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There is an average of 1 hour of sunshine per day. So, the sun shines 16% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is 24 kph (15 mph).
The average sea temperature is of 5 °C (41.5 °F). Therefore, the sea is very cold for swimming.