The climate of Copenhagen is Baltic, that is to say, relatively continental, with cold winters and mild to pleasantly warm summers.
The city is the capital of Denmark and is located on the island of Zealand, in the east of the country. On the other side of the coast, beyond the Øresund strait, lies Malmo, in Sweden.
The city is located at the 55th parallel. The white nights, in which it is not completely dark even at midnight, occur from 4 June to 9 July.
On average, there are 20 days with snow per year, 63 days with night temperatures below freezing, and 13 days with lows below -5 °C (23 °F). During the coldest winters, the temperature generally drops to -15/-16 °C (3/5 °F), as happened for example in February 1978, January 1979, January 1982, January and February 1985, and January 2003. Instead, in January 1987, it reached -18 °C (-0.5 °F), while in February 1956 it reached -19 °C (-2 °F). In summer, there are 15 days with highs above 25 °C (77 °F). In July 2018, the temperature reached 31.7 °C (89 °F).
The average temperature of the coldest month (January) is of 1.3 °C (34 °F), that of the warmest month (July) is of 18.1 °C (65 °F). Here are the average temperatures.

Precipitation amounts to 525 millimeters (20.7 inches) per year: so, it is at an intermediate level. It ranges from 25 mm (1 in) in the driest month (February) to 60 mm (2.4 in) in the wettest (September). Here is the average precipitation.

On average, there are around 1,780 sunshine hours per year. Here are the average sunshine hours per day.

The sea temperature ranges between 2 °C (36 °F) and 18 °C (64 °F). So, it never becomes warm for swimming (if not for Northern Europeans). Here are the average sea temperatures.

Best Time

The best time to visit Copenhagen 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.