in the final days before the end of World War II in Europe, Plzeň was liberated from Nazi Germany by the 16th Armored Division of General George Patton's 3rd Army. Also participating in the liberation of the city were elements of the 97th and 2nd Infantry Divisions supported by the Polish Holy Cross Mountains Brigade. Other Third Army units liberated major portions of Western Bohemia. The rest of Czechoslovakia was liberated from German control by the Soviet Red Army. Elements of the 3rd Army, as well as units from the 1st Army, remained in Plzeň until late November 1945. Communist era After the 1948 Czechoslovak coup d'état, the government launched a currency reform in 1953, which caused a wave of discontent, including the Plzeň uprising. On 1 June 1953, over 20,000 people, mainly workers at the Škoda Works, began protesting against the government. Protesters forced their way into the town hall and threw communist symbols, furniture and other objects out of the windows. The protest caused a retaliation from the government. As part of its retaliation, they destroyed the statue of Tomáš Garrigue Masaryk. The statue has since been re-erected. The next year, a West German homing pigeon was lost near the Czechoslovak border. It returned two days later, bearing a strong anticommunist message, signed "Unbowed Pilsen." The bird, named Leaping Lena, was taken to the United States, where it was celebrated as a Cold War hero. Demographics Geography and climate Plzeň has a cool and temperate Oceanic climate (Cfb). Plzeň has low rainfall ( year average) evenly spread over the year. Precipitation occurs on average every second day, and the number of days with thunderstorms is 19. It receives on average 1,700 hours of sunshine though winters have longer periods without sunshine. Terrain features and a relatively low altitude () give some shelter from strong winds. Winters are chilly but milder than some adjacent areas. Snow cover is erratic and lasts on average for 51 days. Though an average year has 113 days with minimum temperature below zero, the temperature falls below on 5 days. The record low temperatures is around . Winters are often murky with frequent long-standing haze. Spring is short, and in April to June there is blooming vegetation. Summer lasts from the end of May until the first third of September. During that period Plzeň has changeable weather which can be warm to hot. Temperatures