🇩🇰Denmark

Denmark lies between 54°33′ and 57°45′N as a low-lying Scandinavian peninsula and archipelago—the Jutland mainland and around 400 islands including Zealand, Funen, and Bornholm—flanked by the North Sea on the west and the Baltic on the east. The highest natural point is Møllehøj at only 170.86 m, making it one of the flattest countries in Europe. The climate is uniformly oceanic Cfb, moderated by surrounding seas and the prevailing westerlies, with a slightly drier and more continental Dfb tendency on the eastern islands and Bornholm. This description excludes Greenland and the Faroe Islands.

Copenhagen averages 1°C in January and 18°C in July with 615 mm of rainfall, evenly distributed but with a slight late-summer to autumn maximum. Aarhus in eastern Jutland is similar. Esbjerg on the windswept North Sea coast is mild and wet, receiving around 835 mm with frequent gales. Bornholm is sunnier and slightly drier.

Winter temperatures rarely drop below −15°C thanks to maritime moderation, but the 1942 Brønderslev cold snap reached −31.2°C. Summer maxima generally peak around 30°C, with a national record of 36.4°C at Holstebro in 1975. Westerlies bring Atlantic depressions year-round.

Denmark has experienced several significant North Atlantic storm events in recent decades, including Storm Knud (October 2017), Storm Bodil (2013, with notable Baltic surge impacts), and Storm Anatol (December 1999). Recurrent storm surge events occur in the Storebælt and Wadden Sea regions. Rising sea levels coupled with increasing intensity of winter storms create mounting hazards for the Wadden Sea coast—a UNESCO biosphere reserve—and the low-lying southern islands of Lolland and Falster.

Our archive covers 4 Danish cities with daily ERA5 reanalysis data going back to 1940. The warmest July averages occur in Odense, around 21.1°C, while Copenhagen records the coldest January nights near −2°C. Comparing the last decade against the 1940–1970 baseline, mean temperatures across these cities have risen by about 1.8°C.