 In the warmest regions (such as Catamarca, La Rioja, San Juan and the eastern outreaches of Mendoza), summer temperatures during the growing season can be very hot during the day with temperatures upwards of .Nighttime temperatures can drop to creating a wide diurnal temperature variation.Some regions have more temperate climates such as the Cafayate region of Salta, Río Negro and the western reaches of Mendoza which includes the Luján de Cuyo and Tupungato departments.