🇭🇷Croatia

Croatia is a Central European country spanning approximately 56,594 km² between 42°23′–46°33′N on the eastern Adriatic. The nation divides into three distinct natural regions: the Pannonian lowland in the north encompassing Zagreb and Slavonia, the mountainous Dinaric Alps spine crowned by Dinara at 1,831 meters (the country's highest peak), and the long Adriatic coastline with over 1,200 islands.

This topographic diversity creates a pronounced climate gradient from humid continental (Cfb/Dfb) across the Pannonian interior and inland mountains to hot-summer Mediterranean (Csa) along the Adriatic coast and islands including Split, Dubrovnik, and Hvar, with subarctic and tundra conditions (Dfc/ET) on the highest Dinaric peaks. Regional winds—the cold dry Bora, the warm Sirocco, and Mediterranean frontal storms—strongly modulate local weather patterns.

Zagreb in the continental interior averages 1°C in January and 22°C in July with 870 mm annual rainfall and snowy winters. Split on the Adriatic coast records 8°C in January and 26°C in July with 760 mm and bone-dry summers, while Dubrovnik shows 9°C and 26°C with 1,250 mm. Osijek in continental Slavonia experiences harsh winters at 0°C in January and 22°C in July with 660 mm precipitation. Rijeka on the Kvarner Gulf averages 7°C and 23°C with 1,560 mm, ranking among Europe's wettest coastal cities. Mount Velebit summits average −5°C with deep winter snowpack and ferocious Bora gusts that have reached a record 304 km/h at Maslenica.

Our archive covers 2 Croatian cities with daily ERA5 reanalysis data going back to 1940. The warmest July averages occur in Zagreb, around 27.4°C, while Zagreb records the coldest January nights near −3.2°C. Comparing the last decade against the 1940–1970 baseline, mean temperatures across these cities have risen by about 2.1°C.