A cold front from Patagonia caused temperatures in Buenos Aires to drop from a high of 38.1 C (100.6 degrees Fahrenheit) last Sunday to only 7.9C (46.2F) on Thursday -- a record low for the month of February since 1951, the National Meteorological Service reported.
The lowest ever was 4.2C in 1910.
The South American country this week battled its eighth heat wave so far this summer with temperatures shooting up to nearly 40C (104F) in the center and north.
But in the same week, on Friday, snow fell for the first time since records began in the low peaks of the Sierra de la Ventana mountains some 560 kilometers (350 miles) west of the capital Buenos Aires, with a minimum of minus 4C recorded in the town of the same name.
Record February lows were also recorded elsewhere as a mass of cold air from the South Pole entered central Argentina after crossing the Andes from neighboring Chile, according to meteorologist Christian Garavaglia.
In just five days, Buenos Aires's streets turned from sunny to grey, from people wiping off sweat to donning coats.
The "extreme variability" was likely caused by a strong La Nina weather phenomenon, said Garavaglia.
He said La Nina causes the air and soil to be drier than usual, which makes for more extreme temperature swings.
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