🇮🇹Italy

Italy spans 35°29′–47°05′N, a southern European country covering approximately 301,340 km² shaped like a boot on the central Mediterranean, with major regions including the Po Valley north containing Milan, Turin, and Bologna, the Italian Alps along the northern border where Monte Bianco reaches 4,809 m on the French frontier and the Monte Rosa massif rises on the Swiss frontier, the Apennine spine running the length of the peninsula with Gran Sasso at 2,912 m, the Tyrrhenian and Adriatic coasts, and the major islands of Sardinia and Sicily featuring Mount Etna at over 3,300 m, Europe's most active volcano. This topography produces a striking climate spectrum: humid subtropical (Cfa) across the Po Valley, hot-summer Mediterranean (Csa) along the Tyrrhenian and southern coasts including Rome, Naples, Palermo, and Catania, warm-summer Mediterranean (Csb) on the higher Apennine slopes, oceanic (Cfb) in the Alpine foothills, and tundra or ice cap (ET / EF) on the highest Alpine summits.

Milan in the Po Valley has cold winters and hot summers, experiencing frequent winter Po fog and intense summer thunderstorms. Rome records January highs of 13°C (lows 3°C) and July highs of 33°C with 750 mm and dry summers; Naples 13°C (5°C) and 30°C with 1,010 mm; Palermo 15°C (9°C) and 31°C with 590 mm; Cagliari in Sardinia 15°C (5°C) and 32°C with 400 mm; Bolzano in the Alpine foothills 7°C (−3°C) and 30°C with 740 mm; Cortina d'Ampezzo at 1,224 m elevation 4°C (−5°C) and 22°C with 1,140 mm and reliable winter snow.

Major events include the 2003 European heatwave with approximately 20,000 excess deaths in Italy, the 47.0°C reading at Foggia in June 2007 and 48.8°C at Floridia in Sicily during August 2021 (Europe's verified record), severe Alpine glacier changes including the July 2022 Marmolada incident (eleven deaths), the May 2023 Emilia-Romagna floods, autumn floods on the Po River, Venice acqua alta events, and Alpine glacier retreat.

Our archive covers 50 Italian cities with daily ERA5 reanalysis data going back to 1940. The hottest July afternoons are in Catania, with average highs around 32.8°C, while Bolzano has the coldest January nights, with average lows near −3.4°C. Comparing the last decade against the 1940–1970 baseline, mean temperatures across these cities have risen by about 2°C.