Winters in Marietta are cool, with temperatures typically ranging from freezing to mild, averaging around 8-12°C. Spring brings a gradual warming trend, with March and April being the warmest months so far, reaching averages of 15-16°C. Summer is warm to hot, with July and August often seeing highs above 30°C, but with relatively consistent temperatures throughout the season, averaging around 26°C. Autumn cools down quickly, with September and October experiencing a decline in temperature, averaging around 18-22°C, before dropping into the cooler winter months.