🇷🇴Romania

Romania (238,397 km²) occupies southeastern Europe between 43°37′–48°15′N, bordered by the Black Sea (245 km coastline) to the east, the Danube River forming much of the southern border, and the dramatic arc of the Carpathian Mountains (highest peak Moldoveanu at 2,544 m) sweeping through the center, dividing the country into distinct climatic zones: Transylvania's interior plateau, the Wallachian and Moldavian plains, the coastal Dobrogea region, and the Danube Delta.

The climate is temperate continental (Köppen Cfb/Dfb transitioning to Cfa along the coast), with the Carpathians blocking Atlantic maritime influences and creating pronounced regional variations—mountain areas receive over 1,010 mm precipitation annually with cool summers and snowy winters, while the interior plains and Dobrogea coast are drier (381–635 mm) with hot summers and cold winters.

Mean annual temperatures range from 6°C in mountain regions to 11°C in southern plains; Bucharest records −3°C in January and 23°C in July. The country's major river systems—Siret, Prut, Olt, Mureș, and Argeș—all drain into the Danube, which flows 1,075 km through Romanian territory before emptying into the Black Sea via the biodiverse Danube Delta.

Bucharest averages −3°C in January and 23°C in July with 550 mm annual precipitation. Cluj-Napoca registers −3°C in January and 19°C in July with 650 mm. Timișoara (western Banat) reaches −1°C in January and 21°C in July with 600 mm. Constanța on the Black Sea coast records 0°C in January and 22°C in July with 380 mm plus maritime moderation. Iași (eastern Moldavia) averages −4°C in January and 20°C in July with 520 mm.

Romania has experienced significant climate events including the September 2024 Galați floods (Storm Boris, 7 deaths), the 2022 heatwave (41°C in Bucharest), the 2005 floods, the 2010 Vrancea floods, and the 2018–22 drought. National temperature extremes are 44.5°C (1951, Brăila County) and −38.5°C (1942, Brașov County), with a warm overnight low of 29.8°C recorded in Oravița in 2024.

Our archive covers 26 Romanian cities with daily ERA5 reanalysis data going back to 1940. The warmest July averages occur in Craiova, around 29.9°C, while Piatra Neamţ records the coldest January nights near −8.3°C. Comparing the last decade against the 1940–1970 baseline, mean temperatures across these cities have risen by about 2°C.