Merlo's climate is characterized by mild winters, with average temperatures ranging from 0-6°C in May and June, and occasional cold snaps dipping as low as -3°C. Spring brings moderate temperatures, gradually warming up to averages of 15-20°C in September and October. Summer months are hot and humid, with temperatures often soaring above 30°C, especially in December and November. Autumn sees a slight cooling trend, but still experiences warm days with temperatures occasionally reaching over 25°C.